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

In mathematics

102 is an abundant number and a semiperfect number. It is a sphenic number.

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

102 is the first three-digit 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.

102⁶⁴ + 1 is a prime number

There are 102 vertices in the Biggs–Smith graph.

In science

• The atomic number of nobelium, an actinide.

In other fields

102 is also:

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