256781224 has 16 divisors (see below), whose sum is σ = 550245600. Its totient is φ = 110049072.

The previous prime is 256781159. The next prime is 256781249. The reversal of 256781224 is 422187652.

It is a happy number.

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, 2292634 + ... + 2292745.

It is an arithmetic number, because the mean of its divisors is an integer number (34390350).

Almost surely, 2^256781224 is an apocalyptic number.

It is an amenable number.

256781224 is an abundant number, since it is smaller than the sum of its proper divisors (293464376).

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

256781224 is a wasteful number, since it uses less digits than its factorization.

256781224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585392 (or 4585388 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 256781224 is about 16024.3946531530. The cubic root of 256781224 is about 635.6056585293.

The spelling of 256781224 in words is "two hundred fifty-six million, seven hundred eighty-one thousand, two hundred twenty-four".