256839928 has 16 divisors (see below), whose sum is σ = 485092080. Its totient is φ = 127482048.

The previous prime is 256839917. The next prime is 256839943. The reversal of 256839928 is 829938652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116076 + ... + 118267.

It is an arithmetic number, because the mean of its divisors is an integer number (30318255).

Almost surely, 2^256839928 is an apocalyptic number.

It is an amenable number.

256839928 is a deficient number, since it is larger than the sum of its proper divisors (228252152).

256839928 is a wasteful number, since it uses less digits than its factorization.

256839928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234486 (or 234482 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The square root of 256839928 is about 16026.2262557347. The cubic root of 256839928 is about 635.6540911353.

The spelling of 256839928 in words is "two hundred fifty-six million, eight hundred thirty-nine thousand, nine hundred twenty-eight".