170 (number)
Encyclopedia : 1 : 17 : 170 : 170 (number)
170 is the natural number following 169 and preceding 171.
| |||
| Ordinal | One hundred [and] seventy | ||
| Cardinal | 170th | ||
| Factorization | [ 2 \cdot 5 \cdot 17] | ||
| Roman numeral | CLXX | ||
| Binary | 10101010 | ||
| Hexadecimal | AA | ||
One hundred [and] seventy is a sphenic number. It is the smallest n for which φ(n) and σ(n) are both square. But 170 is never a solution for φ(x), making it a nontotient. Nor is it ever a solution to x - φ(x), making it a noncototient. 170 is a repdigit in base 4 (2222).
One hundred [and] seventy is also
- The designation of a spur route of Interstate 70.
- The year AD 170 or 170 BC.
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