170 (number)

170 is the natural number following 169 and preceding 171.

In mathematics

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).

In other fields

One hundred [and] seventy is also

• The year AD 170 or 170 BC.
• The largest number that Google's built-in calculator function will compute the factorial of.cv:170 (хисеп)

co:170 (numeru) fr:170 (nombre) ko:170 ht:170 (nonm) ms:170 (nombor) ja:170 no:170 (tall) pl:170 (liczba) ru:170 (число) sl:170 (število) vi:170 (số) wuu:170