256407904 has 24 divisors (see below), whose sum is σ = 506255400. Its totient is φ = 127835136.

The previous prime is 256407829. The next prime is 256407919. The reversal of 256407904 is 409704652.

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 3 ways as a sum of consecutive naturals, for example, 54 + ... + 22645.

It is an arithmetic number, because the mean of its divisors is an integer number (21093975).

Almost surely, 2^256407904 is an apocalyptic number.

It is an amenable number.

256407904 is a deficient number, since it is larger than the sum of its proper divisors (249847496).

256407904 is a wasteful number, since it uses less digits than its factorization.

256407904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23062 (or 23054 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 256407904 is about 16012.7419263535. The cubic root of 256407904 is about 635.2974851808.

The spelling of 256407904 in words is "two hundred fifty-six million, four hundred seven thousand, nine hundred four".