256783568 has 20 divisors (see below), whose sum is σ = 498809220. Its totient is φ = 128058624.

The previous prime is 256783567. The next prime is 256783591. The reversal of 256783568 is 865387652.

256783568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 69422224 + 187361344 = 8332^2 + 13688^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256783561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14405 + ... + 26852.

It is an arithmetic number, because the mean of its divisors is an integer number (24940461).

Almost surely, 2^256783568 is an apocalyptic number.

It is an amenable number.

256783568 is a deficient number, since it is larger than the sum of its proper divisors (242025652).

256783568 is a wasteful number, since it uses less digits than its factorization.

256783568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41654 (or 41648 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 50.

The square root of 256783568 is about 16024.4677914744. The cubic root of 256783568 is about 635.6075925429.

The spelling of 256783568 in words is "two hundred fifty-six million, seven hundred eighty-three thousand, five hundred sixty-eight".