256680717 has 32 divisors (see below), whose sum is σ = 359884800. Its totient is φ = 162594432.

The previous prime is 256680707. The next prime is 256680719. The reversal of 256680717 is 717086652.

256680717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256680717 - 2⁴ = 256680701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256680719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 906858 + ... + 907140.

It is an arithmetic number, because the mean of its divisors is an integer number (11246400).

Almost surely, 2^256680717 is an apocalyptic number.

It is an amenable number.

256680717 is a deficient number, since it is larger than the sum of its proper divisors (103204083).

256680717 is a wasteful number, since it uses less digits than its factorization.

256680717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 256680717 is about 16021.2582839177. The cubic root of 256680717 is about 635.5227200216.

The spelling of 256680717 in words is "two hundred fifty-six million, six hundred eighty thousand, seven hundred seventeen".