668504 has 8 divisors (see below), whose sum is σ = 1253460. Its totient is φ = 334248.

The previous prime is 668471. The next prime is 668509. The reversal of 668504 is 405866.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41774 + ... + 41789.

2⁶⁶⁸⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

668504 is a deficient number, since it is larger than the sum of its proper divisors (584956).

668504 is a wasteful number, since it uses less digits than its factorization.

668504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83569 (or 83565 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 668504 is about 817.6209390665. The cubic root of 668504 is about 87.4382257860.

The spelling of 668504 in words is "six hundred sixty-eight thousand, five hundred four".