256654320 has 80 divisors (see below), whose sum is σ = 856840992. Its totient is φ = 63175680.

The previous prime is 256654319. The next prime is 256654339. The reversal of 256654320 is 23456652.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 38011 + ... + 44250.

Almost surely, 2^256654320 is an apocalyptic number.

256654320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256654320 is an abundant number, since it is smaller than the sum of its proper divisors (600186672).

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

256654320 is a wasteful number, since it uses less digits than its factorization.

256654320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82290 (or 82284 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 256654320 is about 16020.4344510378. The cubic root of 256654320 is about 635.5009335930.

The spelling of 256654320 in words is "two hundred fifty-six million, six hundred fifty-four thousand, three hundred twenty".