128 (number)
128 (one hundred [and] twenty-eight) is the natural number following 127 and preceding 129.
| 128 | |
|---|---|
| Cardinal | one hundred [and] twenty-eight |
| Ordinal | 128th (one hundred [and] twenty-eighth) |
| Numeral system | 128 |
| Factorization |  |
| Divisors | 1, 2, 4, 8, 16, 32, 64, 128 |
| Roman numeral | CXXVIII |
| Binary | 100000002 |
| Octal | 2008 |
| Duodecimal | A812 |
| Hexadecimal | 8016 |
Contents |
In mathematics
One hundred [and] twenty-eight is the seventh power of 2. It is the largest number which cannot be expressed as the sum of any number of distinct squares.[1][2] But it is divisible by the total number of its divisors, making it a refactorable number.[3]
The sum of Euler's totient function φ(x) over the first twenty integers is 128.[4]
128 can be expressed by a combination of its digits with mathematical operators thus 128 = 28 - 1, making it a Friedman number in base 10.[5]
128 is the only 3-digit number that is a 7th power. 2 to the 7th power.
In bar codes
- Code 128 is a Uniform Symbology Specification (USS Code 128) alphanumeric bar code that encodes text, numbers, numerous functions, and designed to encode all 128 ASCII characters (ASCII 0 to ASCII 128.), as used in the shipping industry.
- International Symbology Specification Code (ISS Code) 128 is the USS Code for encoding of extended non-English ASCII characters
- Subdivisions include:
- 128A (0-9, A-Z, ASCII control codes, special characters)
- 128B (0-9, A-Z, a-z, special characters)
- 128C (00-99 numeric characters)
- GS1-128 application standard of the GS1 implementation using the Code 128 barcode specification
- ISBT 128 system for blood product labeling for the International Society of Blood Transfusion
In computing
- 128-bit key size encryption for secure communications over the Internet
- ASCII includes definitions for 128 characters (33 non-printing characters, mostly obsolete control characters that affect how text is processed, and 94 printable)
- CAST-128 is a block cipher used in a number of products, notably as the default cipher in some versions of GPG and PGP.
- Graphics cards have a 128-bit or 256-bit data bus to memory.
- Atari 2600 consoles have 128 bytes of memory
- Sony's PlayStation 2 Emotion Engine CPU has two 128-bit vector units
- Macintosh 128K was the original Apple Macintosh personal computer released in 1984
- Laser 128 released by VTech was a clone of the Apple II released in 1984
- Commodore 128 home/personal computer which had a 128 KB of memory released in 1985
- Enterprise Zilog Z80 home computer released in 1985
- Jane 128 was a GUI-based integrated software package for the Commodore 128 personal computer released in 1985
- RIVA 128 (Real-time Interactive Video and Animation accelerator) was one of the first consumer graphics chips to integrate 3D and video acceleration in 1997
- Super Mario 128 is a cancelled Nintendo game, though many elements were included in Super Mario Galaxy and Pikmin.
In the military
- USNS Mission San Luis Rey (T-AO-128) was a United States Navy Mission Buenaventura class fleet oiler fleet oilers during World War II
- USS Arenac (APA-128) was a United States Navy Haskell-class attack transport during World War II
- USS Cavallaro (APD-128) was a United States Navy Crosley-class high speed transport ship
- USS Leonis (AK-128) was a United States Navy Crater-class cargo ship during World War II
- USS Velocity (AM-128) was a United States Navy Auk-class minesweeper which removed mines from minefields laid in the water
In transportation
- A small car manufactured by Fiat, the Fiat 128 from 1969 to 1985. SEAT 128 was a 2-door coupé version of the car
- The BMW 128i convertible
- Massachusetts Route 128, Boston's inner beltway, approximately 10-mile radius.
- Route 128 Station is a stop on the Massachusetts Bay Transportation Authority Attleboro/Providence MBTA Commuter Rail line in Westwood, Massachusetts
- STS-128 is a currently flying Space Shuttle Discovery mission to the International Space Station for 2009
In other fields
One hundred [and] twenty-eight is also:
- The year AD 128 or 128 BC
- 128 AH is a year in the Islamic calendar that corresponds to 745 – 746 CE
- 128 Nemesis is a main belt asteroid
- Ross 128 is a red dwarf star, eleventh closest star system to the Solar System
- 128P/Shoemaker-Holt is a periodic comet in the Solar system
- The atomic number of unbioctium, an element yet to be discovered.
- The number of musical instruments specified in General MIDI. Sometimes they are numbered 0 to 127 and sometimes they are numbered 1 to 128.
- 128 film, a film format
- Sonnet 128 by William Shakespeare
- In music, a hundred twenty-eighth note is a note played for 1/128 of the duration of a whole note
- 128 is a sacred number honored by Beans for many generations
See also
Notes
- ^ Sprague, R. (1948), "Über Zerlegungen in ungleiche Quadratzahlen", Math. Z. 51: 289–290, doi:10.1007/BF01181594, MR0027285
- ^ OEIS:A001422. Similarly, the largest numbers that cannot be expressed as sums of distinct cubes and fourth powers, respectively, are 12758 and 5134240 (sequence A001661 in OEIS).
- ^ OEIS:A033950.
- ^ OEIS:A002088.
- ^ OEIS:A036057.
References
- Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 138