256928965 has 4 divisors (see below), whose sum is σ = 308314764. Its totient is φ = 205543168.

The previous prime is 256928953. The next prime is 256928977. The reversal of 256928965 is 569829652.

It is a happy number.

256928965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (256928953) and next prime (256928977).

It can be written as a sum of positive squares in 2 ways, for example, as 29311396 + 227617569 = 5414^2 + 15087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256928965 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25692892 + ... + 25692901.

It is an arithmetic number, because the mean of its divisors is an integer number (77078691).

Almost surely, 2^256928965 is an apocalyptic number.

It is an amenable number.

256928965 is a deficient number, since it is larger than the sum of its proper divisors (51385799).

256928965 is an equidigital number, since it uses as much as digits as its factorization.

256928965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51385798.

The product of its digits is 2332800, while the sum is 52.

The square root of 256928965 is about 16029.0038679888. The cubic root of 256928965 is about 635.7275353164.

The spelling of 256928965 in words is "two hundred fifty-six million, nine hundred twenty-eight thousand, nine hundred sixty-five".