680989566 has 32 divisors (see below), whose sum is σ = 1427362560. Its totient is φ = 216185024.

The previous prime is 680989523. The next prime is 680989591. The reversal of 680989566 is 665989086.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21565 + ... + 42743.

It is an arithmetic number, because the mean of its divisors is an integer number (44605080).

Almost surely, 2^680989566 is an apocalyptic number.

680989566 is an abundant number, since it is smaller than the sum of its proper divisors (746372994).

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

680989566 is a wasteful number, since it uses less digits than its factorization.

680989566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21440.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The square root of 680989566 is about 26095.7767847596. The cubic root of 680989566 is about 879.7922917149.

The spelling of 680989566 in words is "six hundred eighty million, nine hundred eighty-nine thousand, five hundred sixty-six".