• 170 can be written using four 4's:

170 has 8 divisors (see below), whose sum is σ = 324. Its totient is φ = 64.

The previous prime is 167. The next prime is 173. The reversal of 170 is 71.

170 is nontrivially palindromic in base 4, base 8, base 13 and base 16.

170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 13^{2}+1.

170 is an esthetic number in base 2 and base 13, because in such bases its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (167) and next prime (173).

It can be written as a sum of positive squares in 2 ways, for example, as 169 + 1 = 13^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a magnanimous number.

170 is an undulating number in base 2, base 8 and base 13.

170 is a nontrivial repdigit in base 4 and base 16.

It is a plaindrome in base 4, base 11, base 12 and base 16.

It is a nialpdrome in base 4, base 6, base 7, base 14, base 15 and base 16.

It is a zygodrome in base 4 and base 16.

In principle, a polygon with 170 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2 + ... + 18.

170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

170 is a deficient number, since it is larger than the sum of its proper divisors (154).

170 is a wasteful number, since it uses less digits than its factorization.

With its successor (171) it forms an eRAP, since the sums of their prime factors are consecutive (24 and 25).

170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24.

The product of its (nonzero) digits is 7, while the sum is 8.

The square root of 170 is about 13.0384048104. The cubic root of 170 is about 5.5396582568.

Subtracting from 170 its reverse (71), we obtain a palindrome (99).

The spelling of 170 in words is "one hundred seventy", and thus it is an aban number and an iban number.

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