256123264 has 16 divisors (see below), whose sum is σ = 510245820. Its totient is φ = 128061568.

The previous prime is 256123261. The next prime is 256123267. The reversal of 256123264 is 462321652.

It is an interprime number because it is at equal distance from previous prime (256123261) and next prime (256123267).

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256123261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000354 + ... + 1000609.

Almost surely, 2^256123264 is an apocalyptic number.

It is an amenable number.

256123264 is a deficient number, since it is larger than the sum of its proper divisors (254122556).

256123264 is an equidigital number, since it uses as much as digits as its factorization.

256123264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000977 (or 2000965 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 256123264 is about 16003.8515364271. The cubic root of 256123264 is about 635.0623155825.

The spelling of 256123264 in words is "two hundred fifty-six million, one hundred twenty-three thousand, two hundred sixty-four".