257831056 has 40 divisors (see below), whose sum is σ = 575302464. Its totient is φ = 109649280.

The previous prime is 257831051. The next prime is 257831087. The reversal of 257831056 is 650138752.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (257831051) 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 7 ways as a sum of consecutive naturals, for example, 5886 + ... + 23458.

Almost surely, 2^257831056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257831056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287651232).

257831056 is an abundant number, since it is smaller than the sum of its proper divisors (317471408).

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

257831056 is a wasteful number, since it uses less digits than its factorization.

257831056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17719 (or 17713 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 257831056 is about 16057.1185459907. The cubic root of 257831056 is about 636.4706904224.

The spelling of 257831056 in words is "two hundred fifty-seven million, eight hundred thirty-one thousand, fifty-six".