680937657 has 16 divisors (see below), whose sum is σ = 922465152. Its totient is φ = 446739200.

The previous prime is 680937623. The next prime is 680937757. The reversal of 680937657 is 756739086.

It is a cyclic number.

It is not a de Polignac number, because 680937657 - 2⁸ = 680937401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680937757) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 43873 + ... + 57329.

It is an arithmetic number, because the mean of its divisors is an integer number (57654072).

Almost surely, 2^680937657 is an apocalyptic number.

It is an amenable number.

680937657 is a deficient number, since it is larger than the sum of its proper divisors (241527495).

680937657 is a wasteful number, since it uses less digits than its factorization.

680937657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13728.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The square root of 680937657 is about 26094.7821795853. The cubic root of 680937657 is about 879.7699368455.

The spelling of 680937657 in words is "six hundred eighty million, nine hundred thirty-seven thousand, six hundred fifty-seven".