256581028 has 12 divisors (see below), whose sum is σ = 489836592. Its totient is φ = 116627720.

The previous prime is 256581011. The next prime is 256581047. The reversal of 256581028 is 820185652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2915650 + ... + 2915737.

It is an arithmetic number, because the mean of its divisors is an integer number (40819716).

Almost surely, 2^256581028 is an apocalyptic number.

It is an amenable number.

256581028 is a deficient number, since it is larger than the sum of its proper divisors (233255564).

256581028 is a wasteful number, since it uses less digits than its factorization.

256581028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5831402 (or 5831400 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 256581028 is about 16018.1468341378. The cubic root of 256581028 is about 635.4404351390.

The spelling of 256581028 in words is "two hundred fifty-six million, five hundred eighty-one thousand, twenty-eight".