256568736 has 48 divisors (see below), whose sum is σ = 675960768. Its totient is φ = 85209600.

The previous prime is 256568729. The next prime is 256568747. The reversal of 256568736 is 637865652.

256568736 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 22221 + ... + 31731.

It is an arithmetic number, because the mean of its divisors is an integer number (14082516).

Almost surely, 2^256568736 is an apocalyptic number.

It is an amenable number.

256568736 is an abundant number, since it is smaller than the sum of its proper divisors (419392032).

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

256568736 is a wasteful number, since it uses less digits than its factorization.

256568736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9805 (or 9797 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 48.

The square root of 256568736 is about 16017.7631397146. The cubic root of 256568736 is about 635.4302876512.

The spelling of 256568736 in words is "two hundred fifty-six million, five hundred sixty-eight thousand, seven hundred thirty-six".