257170256 has 20 divisors (see below), whose sum is σ = 569448672. Its totient is φ = 110215776.

The previous prime is 257170253. The next prime is 257170273. The reversal of 257170256 is 652071752.

It is a happy number.

It is a super-2 number, since 2×257170256² = 132273081142211072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257170253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1147970 + ... + 1148193.

Almost surely, 2^257170256 is an apocalyptic number.

It is an amenable number.

257170256 is an abundant number, since it is smaller than the sum of its proper divisors (312278416).

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

257170256 is a wasteful number, since it uses less digits than its factorization.

257170256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296178 (or 2296172 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 257170256 is about 16036.5288014583. The cubic root of 257170256 is about 635.9264843892.

It can be divided in two parts, 2571 and 70256, that added together give a palindrome (72827).

The spelling of 257170256 in words is "two hundred fifty-seven million, one hundred seventy thousand, two hundred fifty-six".