680507644 has 12 divisors (see below), whose sum is σ = 1191081024. Its totient is φ = 340198784.

The previous prime is 680507609. The next prime is 680507669. The reversal of 680507644 is 446705086.

It is a junction number, because it is equal to n+sod(n) for n = 680507597 and 680507606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28437 + ... + 46579.

It is an arithmetic number, because the mean of its divisors is an integer number (99256752).

Almost surely, 2^680507644 is an apocalyptic number.

It is an amenable number.

680507644 is a deficient number, since it is larger than the sum of its proper divisors (510573380).

680507644 is a wasteful number, since it uses less digits than its factorization.

680507644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27524 (or 27522 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 680507644 is about 26086.5414342339. The cubic root of 680507644 is about 879.5847059026.

The spelling of 680507644 in words is "six hundred eighty million, five hundred seven thousand, six hundred forty-four".