680399988 has 24 divisors (see below), whose sum is σ = 1590650208. Its totient is φ = 226364256.

The previous prime is 680399981. The next prime is 680399999. The reversal of 680399988 is 889993086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680399981) 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, 47931 + ... + 60482.

It is an arithmetic number, because the mean of its divisors is an integer number (66277092).

Almost surely, 2^680399988 is an apocalyptic number.

It is an amenable number.

680399988 is an abundant number, since it is smaller than the sum of its proper divisors (910250220).

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

680399988 is a wasteful number, since it uses less digits than its factorization.

680399988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108943 (or 108941 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 60.

The square root of 680399988 is about 26084.4779131191. The cubic root of 680399988 is about 879.5383201562.

The spelling of 680399988 in words is "six hundred eighty million, three hundred ninety-nine thousand, nine hundred eighty-eight".