256780568 has 32 divisors (see below), whose sum is σ = 525856320. Its totient is φ = 116580000.

The previous prime is 256780549. The next prime is 256780577. The reversal of 256780568 is 865087652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126683 + ... + 128693.

It is an arithmetic number, because the mean of its divisors is an integer number (16433010).

Almost surely, 2^256780568 is an apocalyptic number.

It is an amenable number.

256780568 is an abundant number, since it is smaller than the sum of its proper divisors (269075752).

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

256780568 is a wasteful number, since it uses less digits than its factorization.

256780568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479 (or 3475 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 256780568 is about 16024.3741843480. The cubic root of 256780568 is about 635.6051172674.

The spelling of 256780568 in words is "two hundred fifty-six million, seven hundred eighty thousand, five hundred sixty-eight".