668804 has 12 divisors (see below), whose sum is σ = 1190028. Its totient is φ = 328800.

The previous prime is 668803. The next prime is 668813. The reversal of 668804 is 408866.

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 577600 = 302^2 + 760^2 .

It is not an unprimeable number, because it can be changed into a prime (668803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127 + ... + 1614.

It is an arithmetic number, because the mean of its divisors is an integer number (99169).

2⁶⁶⁸⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

668804 is a deficient number, since it is larger than the sum of its proper divisors (521224).

668804 is a wasteful number, since it uses less digits than its factorization.

668804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806 (or 2804 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 668804 is about 817.8043775867. The cubic root of 668804 is about 87.4513035162.

The spelling of 668804 in words is "six hundred sixty-eight thousand, eight hundred four".