256564732 has 12 divisors (see below), whose sum is σ = 457460136. Its totient is φ = 125861840.

The previous prime is 256564729. The next prime is 256564741. The reversal of 256564732 is 237465652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604894 + ... + 605317.

It is an arithmetic number, because the mean of its divisors is an integer number (38121678).

Almost surely, 2^256564732 is an apocalyptic number.

It is an amenable number.

256564732 is a deficient number, since it is larger than the sum of its proper divisors (200895404).

256564732 is a wasteful number, since it uses less digits than its factorization.

256564732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210268 (or 1210266 counting only the distinct ones).

The product of its digits is 302400, while the sum is 40.

The square root of 256564732 is about 16017.6381529862. The cubic root of 256564732 is about 635.4269821353.

The spelling of 256564732 in words is "two hundred fifty-six million, five hundred sixty-four thousand, seven hundred thirty-two".