680431656 has 32 divisors (see below), whose sum is σ = 1740641760. Its totient is φ = 221535552.

The previous prime is 680431621. The next prime is 680431657. The reversal of 680431656 is 656134086.

It is not an unprimeable number, because it can be changed into a prime (680431657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328635 + ... + 330698.

It is an arithmetic number, because the mean of its divisors is an integer number (54395055).

Almost surely, 2^680431656 is an apocalyptic number.

It is an amenable number.

680431656 is an abundant number, since it is smaller than the sum of its proper divisors (1060210104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

680431656 is a wasteful number, since it uses less digits than its factorization.

680431656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659385 (or 659381 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 680431656 is about 26085.0849337318. The cubic root of 680431656 is about 879.5519654570.

The spelling of 680431656 in words is "six hundred eighty million, four hundred thirty-one thousand, six hundred fifty-six".