668900 has 18 divisors (see below), whose sum is σ = 1451730. Its totient is φ = 267520.

The previous prime is 668879. The next prime is 668903. The reversal of 668900 is 9866.

It can be written as a sum of positive squares in 3 ways, for example, as 118336 + 550564 = 344^2 + 742^2 .

It is not an unprimeable number, because it can be changed into a prime (668903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3245 + ... + 3444.

2⁶⁶⁸⁹⁰⁰ is an apocalyptic number.

It is an amenable number.

668900 is an abundant number, since it is smaller than the sum of its proper divisors (782830).

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

668900 is a wasteful number, since it uses less digits than its factorization.

668900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703 (or 6696 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 668900 is about 817.8630692237. The cubic root of 668900 is about 87.4554875638.

The spelling of 668900 in words is "six hundred sixty-eight thousand, nine hundred".