256588865 has 16 divisors (see below), whose sum is σ = 339682896. Its totient is φ = 184857600.

The previous prime is 256588859. The next prime is 256588873. The reversal of 256588865 is 568885652.

256588865 is digitally balanced in base 2, 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 8 ways, for example, as 74770609 + 181818256 = 8647^2 + 13484^2 .

It is not a de Polignac number, because 256588865 - 2¹⁰ = 256587841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45476 + ... + 50805.

It is an arithmetic number, because the mean of its divisors is an integer number (21230181).

Almost surely, 2^256588865 is an apocalyptic number.

It is an amenable number.

256588865 is a deficient number, since it is larger than the sum of its proper divisors (83094031).

256588865 is a wasteful number, since it uses less digits than its factorization.

256588865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96340.

The product of its digits is 4608000, while the sum is 53.

The square root of 256588865 is about 16018.3914610675. The cubic root of 256588865 is about 635.4469046950.

The spelling of 256588865 in words is "two hundred fifty-six million, five hundred eighty-eight thousand, eight hundred sixty-five".