256831612 has 12 divisors (see below), whose sum is σ = 450016560. Its totient is φ = 128255456.

The previous prime is 256831609. The next prime is 256831649. The reversal of 256831612 is 216138652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36448 + ... + 42919.

It is an arithmetic number, because the mean of its divisors is an integer number (37501380).

Almost surely, 2^256831612 is an apocalyptic number.

It is an amenable number.

256831612 is a deficient number, since it is larger than the sum of its proper divisors (193184948).

256831612 is a wasteful number, since it uses less digits than its factorization.

256831612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80180 (or 80178 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 256831612 is about 16025.9668039092. The cubic root of 256831612 is about 635.6472306282.

The spelling of 256831612 in words is "two hundred fifty-six million, eight hundred thirty-one thousand, six hundred twelve".