256807868 has 48 divisors (see below), whose sum is σ = 472888416. Its totient is φ = 121927680.

The previous prime is 256807849. The next prime is 256807871. The reversal of 256807868 is 868708652.

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 15 ways as a sum of consecutive naturals, for example, 1418738 + ... + 1418918.

It is an arithmetic number, because the mean of its divisors is an integer number (9851842).

Almost surely, 2^256807868 is an apocalyptic number.

It is an amenable number.

256807868 is a deficient number, since it is larger than the sum of its proper divisors (216080548).

256807868 is a wasteful number, since it uses less digits than its factorization.

256807868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The square root of 256807868 is about 16025.2259890461. The cubic root of 256807868 is about 635.6276415637.

The spelling of 256807868 in words is "two hundred fifty-six million, eight hundred seven thousand, eight hundred sixty-eight".