256402564 has 24 divisors (see below), whose sum is σ = 490313376. Its totient is φ = 116352000.

The previous prime is 256402529. The next prime is 256402567. The reversal of 256402564 is 465204652.

It is a hoax number, since the sum of its digits (34) 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 (256402567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23659 + ... + 32749.

It is an arithmetic number, because the mean of its divisors is an integer number (20429724).

Almost surely, 2^256402564 is an apocalyptic number.

It is an amenable number.

256402564 is a deficient number, since it is larger than the sum of its proper divisors (233910812).

256402564 is a wasteful number, since it uses less digits than its factorization.

256402564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9747 (or 9745 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 256402564 is about 16012.5751832739. The cubic root of 256402564 is about 635.2930748746.

The spelling of 256402564 in words is "two hundred fifty-six million, four hundred two thousand, five hundred sixty-four".