256791028 has 12 divisors (see below), whose sum is σ = 483952420. Its totient is φ = 118518912.

The previous prime is 256791013. The next prime is 256791049. The reversal of 256791028 is 820197652.

256791028 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64192144 + 192598884 = 8012^2 + 13878^2 .

It is a super-2 number, since 2×256791028² = 131883264122593568, which contains 22 as substring.

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, 2469093 + ... + 2469196.

Almost surely, 2^256791028 is an apocalyptic number.

It is an amenable number.

256791028 is a deficient number, since it is larger than the sum of its proper divisors (227161392).

256791028 is a wasteful number, since it uses less digits than its factorization.

256791028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938306 (or 4938304 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 256791028 is about 16024.7005588248. The cubic root of 256791028 is about 635.6137476443.

The spelling of 256791028 in words is "two hundred fifty-six million, seven hundred ninety-one thousand, twenty-eight".