256432977 has 12 divisors (see below), whose sum is σ = 380414580. Its totient is φ = 166334688.

The previous prime is 256432933. The next prime is 256432991. The reversal of 256432977 is 779234652.

256432977 is a `hidden beast` number, since 256 + 4 + 329 + 77 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 136399041 + 120033936 = 11679^2 + 10956^2 .

It is not a de Polignac number, because 256432977 - 2⁷ = 256432849 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (256432927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384702 + ... + 385367.

It is an arithmetic number, because the mean of its divisors is an integer number (31701215).

Almost surely, 2^256432977 is an apocalyptic number.

It is an amenable number.

256432977 is a deficient number, since it is larger than the sum of its proper divisors (123981603).

256432977 is a wasteful number, since it uses less digits than its factorization.

256432977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770112 (or 770109 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 256432977 is about 16013.5248149806. The cubic root of 256432977 is about 635.3181921538.

The spelling of 256432977 in words is "two hundred fifty-six million, four hundred thirty-two thousand, nine hundred seventy-seven".