256128504 has 32 divisors (see below), whose sum is σ = 657629520. Its totient is φ = 83068416.

The previous prime is 256128497. The next prime is 256128533. The reversal of 256128504 is 405821652.

It is a super-2 number, since 2×256128504² = 131203621122556032, which contains 22 as substring.

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, 143329 + ... + 145104.

Almost surely, 2^256128504 is an apocalyptic number.

256128504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256128504 is an abundant number, since it is smaller than the sum of its proper divisors (401501016).

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

256128504 is a wasteful number, since it uses less digits than its factorization.

256128504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288479 (or 288475 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 256128504 is about 16004.0152461812. The cubic root of 256128504 is about 635.0666464448.

The spelling of 256128504 in words is "two hundred fifty-six million, one hundred twenty-eight thousand, five hundred four".