680993817 has 12 divisors (see below), whose sum is σ = 1056235536. Its totient is φ = 389139240.

The previous prime is 680993779. The next prime is 680993897. The reversal of 680993817 is 718399086.

It is not a de Polignac number, because 680993817 - 2¹¹ = 680991769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680993817.

It is not an unprimeable number, because it can be changed into a prime (680993897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2316159 + ... + 2316452.

It is an arithmetic number, because the mean of its divisors is an integer number (88019628).

Almost surely, 2^680993817 is an apocalyptic number.

It is an amenable number.

680993817 is a deficient number, since it is larger than the sum of its proper divisors (375241719).

680993817 is a wasteful number, since it uses less digits than its factorization.

680993817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632628 (or 4632621 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 680993817 is about 26095.8582345935. The cubic root of 680993817 is about 879.7941223789.

The spelling of 680993817 in words is "six hundred eighty million, nine hundred ninety-three thousand, eight hundred seventeen".