256631344 has 20 divisors (see below), whose sum is σ = 501788320. Its totient is φ = 127137600.

The previous prime is 256631339. The next prime is 256631381. The reversal of 256631344 is 443136652.

256631344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71832 + ... + 75319.

It is an arithmetic number, because the mean of its divisors is an integer number (25089416).

Almost surely, 2^256631344 is an apocalyptic number.

It is an amenable number.

256631344 is a deficient number, since it is larger than the sum of its proper divisors (245156976).

256631344 is a wasteful number, since it uses less digits than its factorization.

256631344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147268 (or 147262 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 256631344 is about 16019.7173508149. The cubic root of 256631344 is about 635.4819694273.

Adding to 256631344 its reverse (443136652), we get a palindrome (699767996).

The spelling of 256631344 in words is "two hundred fifty-six million, six hundred thirty-one thousand, three hundred forty-four".