256129560 has 64 divisors (see below), whose sum is σ = 853768800. Its totient is φ = 68300928.

The previous prime is 256129513. The next prime is 256129571. The reversal of 256129560 is 65921652.

256129560 is a `hidden beast` number, since 2 + 561 + 2 + 95 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 117499 + ... + 119658.

Almost surely, 2^256129560 is an apocalyptic number.

256129560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256129560 is an abundant number, since it is smaller than the sum of its proper divisors (597639240).

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

256129560 is a wasteful number, since it uses less digits than its factorization.

256129560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237177 (or 237167 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 256129560 is about 16004.0482378678. The cubic root of 256129560 is about 635.0675192222.

The spelling of 256129560 in words is "two hundred fifty-six million, one hundred twenty-nine thousand, five hundred sixty".