256645170 has 24 divisors (see below), whose sum is σ = 667277676. Its totient is φ = 68438688.

The previous prime is 256645163. The next prime is 256645183. The reversal of 256645170 is 71546652.

It is a happy number.

256645170 is a `hidden beast` number, since 2 + 5 + 6 + 645 + 1 + 7 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 240653169 + 15992001 = 15513^2 + 3999^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1425717 + ... + 1425896.

Almost surely, 2^256645170 is an apocalyptic number.

256645170 is an abundant number, since it is smaller than the sum of its proper divisors (410632506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256645170 is a wasteful number, since it uses less digits than its factorization.

256645170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851626 (or 2851623 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 256645170 is about 16020.1488757127. The cubic root of 256645170 is about 635.4933814081.

The spelling of 256645170 in words is "two hundred fifty-six million, six hundred forty-five thousand, one hundred seventy".