680660773 has 16 divisors (see below), whose sum is σ = 777709296. Its totient is φ = 590146560.

The previous prime is 680660719. The next prime is 680660777. The reversal of 680660773 is 377066086.

It can be written as a sum of positive squares in 8 ways, for example, as 64529089 + 616131684 = 8033^2 + 24822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680660773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680660777) 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, 116715 + ... + 122407.

It is an arithmetic number, because the mean of its divisors is an integer number (48606831).

Almost surely, 2^680660773 is an apocalyptic number.

It is an amenable number.

680660773 is a deficient number, since it is larger than the sum of its proper divisors (97048523).

680660773 is a wasteful number, since it uses less digits than its factorization.

680660773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6264.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 680660773 is about 26089.4762883428. The cubic root of 680660773 is about 879.6506761755.

The spelling of 680660773 in words is "six hundred eighty million, six hundred sixty thousand, seven hundred seventy-three".