102 (number)

102 (one hundred [and] two) is the natural number following 101 and preceding 103.

In mathematics

102 is an abundant number and semiperfect number. It is a sphenic number. It is the sum of four consecutive prime numbers (19 + 23 + 29 + 31).

The sum of Euler's totient function φ(x) over the first eighteen integers is 102.

102 is the third base 10 polydivisible number, since 1 is divisible by 1, 10 is divisible by 2 and 102 is divisible by 3. This also shows that 102 is a Harshad number. 102 is the first 3-digit number divisible by the numbers 3, 6, 17, 34 and 51.

In science

• The atomic number of nobelium, an actinide.

In other fields

102 is also:

• The emergency telephone number for police in Ukraine and Belarus
• The emergency telephone number for fire in Israel
• The emergency telephone number for ambulance in parts of India

See also

• List of highways numbered 102
• One Hundred and Two, a song by The Judds

References

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 133