256500057 has 32 divisors (see below), whose sum is σ = 394283520. Its totient is φ = 146689920.

The previous prime is 256500043. The next prime is 256500089. The reversal of 256500057 is 750005652.

It is not a de Polignac number, because 256500057 - 2⁸ = 256499801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256499997 and 256500033.

It is not an unprimeable number, because it can be changed into a prime (256504057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195598 + ... + 196904.

It is an arithmetic number, because the mean of its divisors is an integer number (12321360).

Almost surely, 2^256500057 is an apocalyptic number.

It is an amenable number.

256500057 is a deficient number, since it is larger than the sum of its proper divisors (137783463).

256500057 is a wasteful number, since it uses less digits than its factorization.

256500057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 256500057 is about 16015.6191575599. The cubic root of 256500057 is about 635.3735847029.

The spelling of 256500057 in words is "two hundred fifty-six million, five hundred thousand, fifty-seven".