680664717 has 24 divisors (see below), whose sum is σ = 1055695680. Its totient is φ = 421061760.

The previous prime is 680664709. The next prime is 680664727. The reversal of 680664717 is 717466086.

It is not a de Polignac number, because 680664717 - 2³ = 680664709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680664727) 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 23 ways as a sum of consecutive naturals, for example, 20467 + ... + 42192.

It is an arithmetic number, because the mean of its divisors is an integer number (43987320).

Almost surely, 2^680664717 is an apocalyptic number.

It is an amenable number.

680664717 is a deficient number, since it is larger than the sum of its proper divisors (375030963).

680664717 is a wasteful number, since it uses less digits than its factorization.

680664717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62753 (or 62750 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 680664717 is about 26089.5518742657. The cubic root of 680664717 is about 879.6523751793.

The spelling of 680664717 in words is "six hundred eighty million, six hundred sixty-four thousand, seven hundred seventeen".