256867983 has 16 divisors (see below), whose sum is σ = 384040800. Its totient is φ = 169672320.

The previous prime is 256867967. The next prime is 256867991. The reversal of 256867983 is 389768652.

It is a happy number.

256867983 is a `hidden beast` number, since 2 + 568 + 6 + 79 + 8 + 3 = 666.

It is not a de Polignac number, because 256867983 - 2⁴ = 256867967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256867183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40698 + ... + 46583.

It is an arithmetic number, because the mean of its divisors is an integer number (24002550).

Almost surely, 2^256867983 is an apocalyptic number.

256867983 is a deficient number, since it is larger than the sum of its proper divisors (127172817).

256867983 is a wasteful number, since it uses less digits than its factorization.

256867983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87399 (or 87393 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 256867983 is about 16027.1015158699. The cubic root of 256867983 is about 635.6772347672.

The spelling of 256867983 in words is "two hundred fifty-six million, eight hundred sixty-seven thousand, nine hundred eighty-three".