680923816 has 8 divisors (see below), whose sum is σ = 1276732170. Its totient is φ = 340461904.

The previous prime is 680923811. The next prime is 680923819. The reversal of 680923816 is 618329086.

It can be written as a sum of positive squares in only one way, i.e., 617721316 + 63202500 = 24854^2 + 7950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (680923811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42557731 + ... + 42557746.

Almost surely, 2^680923816 is an apocalyptic number.

It is an amenable number.

680923816 is a deficient number, since it is larger than the sum of its proper divisors (595808354).

680923816 is a wasteful number, since it uses less digits than its factorization.

680923816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85115483 (or 85115479 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 680923816 is about 26094.5169719618. The cubic root of 680923816 is about 879.7639759581.

It can be divided in two parts, 6809 and 23816, that added together give a square (30625 = 175²).

The spelling of 680923816 in words is "six hundred eighty million, nine hundred twenty-three thousand, eight hundred sixteen".