256617328 has 20 divisors (see below), whose sum is σ = 542396088. Its totient is φ = 116644160.

The previous prime is 256617323. The next prime is 256617337. The reversal of 256617328 is 823716652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256617323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728851 + ... + 729202.

Almost surely, 2^256617328 is an apocalyptic number.

It is an amenable number.

256617328 is an abundant number, since it is smaller than the sum of its proper divisors (285778760).

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

256617328 is a wasteful number, since it uses less digits than its factorization.

256617328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458072 (or 1458066 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 256617328 is about 16019.2798839399. The cubic root of 256617328 is about 635.4704002021.

The spelling of 256617328 in words is "two hundred fifty-six million, six hundred seventeen thousand, three hundred twenty-eight".