256680747 has 36 divisors (see below), whose sum is σ = 394258800. Its totient is φ = 160893216.

The previous prime is 256680733. The next prime is 256680751. The reversal of 256680747 is 747086652.

256680747 is a `hidden beast` number, since 2 + 566 + 80 + 7 + 4 + 7 = 666.

It is not a de Polignac number, because 256680747 - 2⁴ = 256680731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256680707) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 646353 + ... + 646749.

Almost surely, 2^256680747 is an apocalyptic number.

256680747 is a deficient number, since it is larger than the sum of its proper divisors (137578053).

256680747 is a wasteful number, since it uses less digits than its factorization.

256680747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The square root of 256680747 is about 16021.2592201737. The cubic root of 256680747 is about 635.5227447809.

The spelling of 256680747 in words is "two hundred fifty-six million, six hundred eighty thousand, seven hundred forty-seven".