102 (number)
From Wikipedia, the free encyclopedia
102 (one hundred [and] two) is the natural number following 101 and preceding 103.
| Cardinal | one hundred [and] two |
| Ordinal | 102nd (one hundred [and] second) |
| Factorization |  |
| Divisors | 2, 3, 6, 17, 34, 51. |
| Roman numeral | CII |
| Binary | 1100110 |
| Hexadecimal | 66 |
[edit] 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.
[edit] In science
- The atomic number of nobelium, an actinide.
In astronomy,
- Messier object M102, possibly the Spindle Galaxy, a magnitude 10.5 spiral galaxy in the constellation Draco
- The New General Catalogue object NGC102, a galaxy in the constellation Cetus
- The Saros number of the solar eclipse series which began on 376 May 5 and ended on 1638 June 12. The duration of Saros series 102 was 1262.1 years, and it contained 71 solar eclipses.
- The Saros number of the lunar eclipse series which began on 461 October 5 and ended on 1958 April 4. The duration of Saros series 102 was 1496.5 years, and it contained 84 lunar eclipses.
[edit] In other fields
102 is also:
- The emergency telephone number for fire in Israel
- In the title of the movie 102 Dalmatians, starring Glenn Close.
- The number of the space shuttle mission STS-102.
- The year AD 102 or 102 BC.
- A London bus running from Edmonton to Golders Green calling at Bounds Green and Muswell Hill
