256536664 has 32 divisors (see below), whose sum is σ = 531450720. Its totient is φ = 115472896.

The previous prime is 256536619. The next prime is 256536677. The reversal of 256536664 is 466635652.

It is a super-2 number, since 2×256536664² = 131622119952497792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256536664.

It is a congruent number.

It is an unprimeable number.

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, 37879 + ... + 44134.

It is an arithmetic number, because the mean of its divisors is an integer number (16607835).

Almost surely, 2^256536664 is an apocalyptic number.

It is an amenable number.

256536664 is an abundant number, since it is smaller than the sum of its proper divisors (274914056).

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

256536664 is a wasteful number, since it uses less digits than its factorization.

256536664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82059 (or 82055 counting only the distinct ones).

The product of its digits is 777600, while the sum is 43.

The square root of 256536664 is about 16016.7619698864. The cubic root of 256536664 is about 635.4038095363.

The spelling of 256536664 in words is "two hundred fifty-six million, five hundred thirty-six thousand, six hundred sixty-four".