668725 has 12 divisors (see below), whose sum is σ = 866016. Its totient is φ = 511280.

The previous prime is 668719. The next prime is 668737. The reversal of 668725 is 527866.

It is a de Polignac number, because none of the positive numbers 2^k-668725 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (72168).

2⁶⁶⁸⁷²⁵ is an apocalyptic number.

It is an amenable number.

668725 is a deficient number, since it is larger than the sum of its proper divisors (197291).

668725 is a wasteful number, since it uses less digits than its factorization.

668725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1191 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 668725 is about 817.7560761009. The cubic root of 668725 is about 87.4478600933.

The spelling of 668725 in words is "six hundred sixty-eight thousand, seven hundred twenty-five".