256338656 has 48 divisors (see below), whose sum is σ = 596665440. Its totient is φ = 106068480.

The previous prime is 256338623. The next prime is 256338689. The reversal of 256338656 is 656833652.

It is an interprime number because it is at equal distance from previous prime (256338623) and next prime (256338689).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13235 + ... + 26226.

It is an arithmetic number, because the mean of its divisors is an integer number (12430530).

Almost surely, 2^256338656 is an apocalyptic number.

It is an amenable number.

256338656 is an abundant number, since it is smaller than the sum of its proper divisors (340326784).

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

256338656 is a wasteful number, since it uses less digits than its factorization.

256338656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39507 (or 39499 counting only the distinct ones).

The product of its digits is 777600, while the sum is 44.

The square root of 256338656 is about 16010.5795023166. The cubic root of 256338656 is about 635.2402885024.

The spelling of 256338656 in words is "two hundred fifty-six million, three hundred thirty-eight thousand, six hundred fifty-six".