668685 has 8 divisors (see below), whose sum is σ = 1069920. Its totient is φ = 356624.

The previous prime is 668677. The next prime is 668687. The reversal of 668685 is 586866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668685 - 2³ = 668677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22275 + ... + 22304.

It is an arithmetic number, because the mean of its divisors is an integer number (133740).

2⁶⁶⁸⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

668685 is a deficient number, since it is larger than the sum of its proper divisors (401235).

668685 is a wasteful number, since it uses less digits than its factorization.

668685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44587.

The product of its digits is 69120, while the sum is 39.

The square root of 668685 is about 817.7316185644. The cubic root of 668685 is about 87.4461164846.

The spelling of 668685 in words is "six hundred sixty-eight thousand, six hundred eighty-five".