680992 has 24 divisors (see below), whose sum is σ = 1444716. Its totient is φ = 314112.

The previous prime is 680989. The next prime is 680993. The reversal of 680992 is 299086.

It can be written as a sum of positive squares in 2 ways, for example, as 524176 + 156816 = 724^2 + 396^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (680993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403 + ... + 1234.

2⁶⁸⁰⁹⁹² is an apocalyptic number.

It is an amenable number.

680992 is an abundant number, since it is smaller than the sum of its proper divisors (763724).

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

680992 is a wasteful number, since it uses less digits than its factorization.

680992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1652 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 680992 is about 825.2223942671. Note that the first 3 decimals coincide. The cubic root of 680992 is about 87.9793339901.

The spelling of 680992 in words is "six hundred eighty thousand, nine hundred ninety-two".