680686820 has 48 divisors (see below), whose sum is σ = 1561424256. Its totient is φ = 247200000.

The previous prime is 680686793. The next prime is 680686841. The reversal of 680686820 is 28686086.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225320 + ... + 228320.

It is an arithmetic number, because the mean of its divisors is an integer number (32529672).

Almost surely, 2^680686820 is an apocalyptic number.

It is an amenable number.

680686820 is an abundant number, since it is smaller than the sum of its proper divisors (880737436).

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

680686820 is a wasteful number, since it uses less digits than its factorization.

680686820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052 (or 4050 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 680686820 is about 26089.9754695170. The cubic root of 680686820 is about 879.6618966296.

The spelling of 680686820 in words is "six hundred eighty million, six hundred eighty-six thousand, eight hundred twenty".