257956 has 6 divisors (see below), whose sum is σ = 451430. Its totient is φ = 128976.

The previous prime is 257953. The next prime is 257981. The reversal of 257956 is 659752.

It can be written as a sum of positive squares in only one way, i.e., 230400 + 27556 = 480^2 + 166^2 .

It is a d-powerful number, because it can be written as 2 + 5⁵ + 9⁵ + 7⁶ + 5⁷ + 6 .

It is not an unprimeable number, because it can be changed into a prime (257953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32241 + ... + 32248.

2²⁵⁷⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

257956 is a deficient number, since it is larger than the sum of its proper divisors (193474).

257956 is a wasteful number, since it uses less digits than its factorization.

257956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64493 (or 64491 counting only the distinct ones).

The product of its digits is 18900, while the sum is 34.

The square root of 257956 is about 507.8936896635. The cubic root of 257956 is about 63.6573484287.

The spelling of 257956 in words is "two hundred fifty-seven thousand, nine hundred fifty-six".