668884 has 6 divisors (see below), whose sum is σ = 1170554. Its totient is φ = 334440.

The previous prime is 668879. The next prime is 668903. The reversal of 668884 is 488866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 595984 + 72900 = 772^2 + 270^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83607 + ... + 83614.

2⁶⁶⁸⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

668884 is a deficient number, since it is larger than the sum of its proper divisors (501670).

668884 is a wasteful number, since it uses less digits than its factorization.

668884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167225 (or 167223 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 668884 is about 817.8532875767. The cubic root of 668884 is about 87.4547902504.

The spelling of 668884 in words is "six hundred sixty-eight thousand, eight hundred eighty-four".