256723998 has 32 divisors (see below), whose sum is σ = 520106496. Its totient is φ = 84470688.

The previous prime is 256723939. The next prime is 256724003. The reversal of 256723998 is 899327652.

It is a super-2 number, since 2×256723998² = 131814422298208008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256723998.

It is a congruent 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, 300540 + ... + 301392.

It is an arithmetic number, because the mean of its divisors is an integer number (16253328).

Almost surely, 2^256723998 is an apocalyptic number.

256723998 is an abundant number, since it is smaller than the sum of its proper divisors (263382498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256723998 is a wasteful number, since it uses less digits than its factorization.

256723998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448.

The product of its digits is 1632960, while the sum is 51.

The square root of 256723998 is about 16022.6089635864. The cubic root of 256723998 is about 635.5584382131.

It can be divided in two parts, 2567 and 23998, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 256723998 in words is "two hundred fifty-six million, seven hundred twenty-three thousand, nine hundred ninety-eight".