# 170 (number)

170 (number)

170 (one hundred [and] seventy) is the natural number following 169 and preceding 171.

 List of numbers — Integers << 170 171 172 173 174 175 176 177 178 179 >>
Cardinal One hundred [and]
seventy
Ordinal 170th
Factorization $2 \cdot 5 \cdot 17$
Divisors 1, 2, 5, 10, 17, 34, 85, 170
Roman numeral CLXX
Binary 10101010

## In mathematics

170 is the smallest n for which φ(n) and σ(n) are both square(64 and 324 respectively). 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.

The proper divisors of 170 are 1, 2, 5, 10, 17, 34, and 85. These add up to 154, which is less than 170, and thus 170 is a deficient number.

Written as 2222 in base 4, 170 is a repdigit.

170 is the largest integer for which Google's built-in calculator function can compute the factorial, returning the answer as 170! = 7.25741562 × 10306.

## In sports

• 170 is the maximum check-out possible in a standard game of darts (where the final score must be a double).[citation needed] It consists of two treble-twenties and a double-bullseye.

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