256857879 has 16 divisors (see below), whose sum is σ = 364052448. Its totient is φ = 160530432.

The previous prime is 256857869. The next prime is 256857893. The reversal of 256857879 is 978758652.

It is a happy number.

It is not a de Polignac number, because 256857879 - 2⁴ = 256857863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256857869) 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, 3309 + ... + 22905.

It is an arithmetic number, because the mean of its divisors is an integer number (22753278).

Almost surely, 2^256857879 is an apocalyptic number.

256857879 is a deficient number, since it is larger than the sum of its proper divisors (107194569).

256857879 is a wasteful number, since it uses less digits than its factorization.

256857879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19874.

The product of its digits is 8467200, while the sum is 57.

The square root of 256857879 is about 16026.7862966972. The cubic root of 256857879 is about 635.6688997891.

The spelling of 256857879 in words is "two hundred fifty-six million, eight hundred fifty-seven thousand, eight hundred seventy-nine".