256897688 has 16 divisors (see below), whose sum is σ = 481950000. Its totient is φ = 128377696.

The previous prime is 256897679. The next prime is 256897709. The reversal of 256897688 is 886798652.

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, 8438 + ... + 24186.

It is an arithmetic number, because the mean of its divisors is an integer number (30121875).

Almost surely, 2^256897688 is an apocalyptic number.

It is an amenable number.

256897688 is a deficient number, since it is larger than the sum of its proper divisors (225052312).

256897688 is a wasteful number, since it uses less digits than its factorization.

256897688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17794 (or 17790 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 59.

The square root of 256897688 is about 16028.0282006241. The cubic root of 256897688 is about 635.7017377099.

The spelling of 256897688 in words is "two hundred fifty-six million, eight hundred ninety-seven thousand, six hundred eighty-eight".