680804138 has 24 divisors (see below), whose sum is σ = 1190222244. Its totient is φ = 291211200.

The previous prime is 680804129. The next prime is 680804141. The reversal of 680804138 is 831408086.

It can be written as a sum of positive squares in 2 ways, for example, as 677717089 + 3087049 = 26033^2 + 1757^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46598 + ... + 59438.

Almost surely, 2^680804138 is an apocalyptic number.

680804138 is a deficient number, since it is larger than the sum of its proper divisors (509418106).

680804138 is a wasteful number, since it uses less digits than its factorization.

680804138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13398 (or 13391 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 680804138 is about 26092.2237074574. The cubic root of 680804138 is about 879.7124310032.

The spelling of 680804138 in words is "six hundred eighty million, eight hundred four thousand, one hundred thirty-eight".