668975 has 6 divisors (see below), whose sum is σ = 829560. Its totient is φ = 535160.

The previous prime is 668963. The next prime is 668989. The reversal of 668975 is 579866.

It is a happy number.

It is not a de Polignac number, because 668975 - 2⁴ = 668959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13355 + ... + 13404.

It is an arithmetic number, because the mean of its divisors is an integer number (138260).

2⁶⁶⁸⁹⁷⁵ is an apocalyptic number.

668975 is a deficient number, since it is larger than the sum of its proper divisors (160585).

668975 is a wasteful number, since it uses less digits than its factorization.

668975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26769 (or 26764 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 668975 is about 817.9089191346. The cubic root of 668975 is about 87.4587560726.

The spelling of 668975 in words is "six hundred sixty-eight thousand, nine hundred seventy-five".