680683621 has 16 divisors (see below), whose sum is σ = 747748800. Its totient is φ = 616750848.

The previous prime is 680683613. The next prime is 680683691. The reversal of 680683621 is 126386086.

It is a cyclic number.

It is not a de Polignac number, because 680683621 - 2³ = 680683613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680683691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185026 + ... + 188668.

It is an arithmetic number, because the mean of its divisors is an integer number (46734300).

Almost surely, 2^680683621 is an apocalyptic number.

It is an amenable number.

680683621 is a deficient number, since it is larger than the sum of its proper divisors (67065179).

680683621 is a wasteful number, since it uses less digits than its factorization.

680683621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 680683621 is about 26089.9141623732. The cubic root of 680683621 is about 879.6605185888.

The spelling of 680683621 in words is "six hundred eighty million, six hundred eighty-three thousand, six hundred twenty-one".