256504280 has 32 divisors (see below), whose sum is σ = 602229600. Its totient is φ = 98140416.

The previous prime is 256504229. The next prime is 256504291. The reversal of 256504280 is 82405652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138485 + ... + 140324.

It is an arithmetic number, because the mean of its divisors is an integer number (18819675).

Almost surely, 2^256504280 is an apocalyptic number.

256504280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256504280 is an abundant number, since it is smaller than the sum of its proper divisors (345725320).

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

256504280 is a wasteful number, since it uses less digits than its factorization.

256504280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278843 (or 278839 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 256504280 is about 16015.7509970654. The cubic root of 256504280 is about 635.3770716000.

The spelling of 256504280 in words is "two hundred fifty-six million, five hundred four thousand, two hundred eighty".