256659568 has 20 divisors (see below), whose sum is σ = 542485368. Its totient is φ = 116663360.

The previous prime is 256659563. The next prime is 256659587. The reversal of 256659568 is 865956652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256659563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728971 + ... + 729322.

Almost surely, 2^256659568 is an apocalyptic number.

It is an amenable number.

256659568 is an abundant number, since it is smaller than the sum of its proper divisors (285825800).

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

256659568 is a wasteful number, since it uses less digits than its factorization.

256659568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458312 (or 1458306 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 52.

The square root of 256659568 is about 16020.5982410146. The cubic root of 256659568 is about 635.5052650821.

The spelling of 256659568 in words is "two hundred fifty-six million, six hundred fifty-nine thousand, five hundred sixty-eight".