668885 has 16 divisors (see below), whose sum is σ = 950400. Its totient is φ = 442176.

The previous prime is 668879. The next prime is 668903. The reversal of 668885 is 588866.

668885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668885 - 2⁴ = 668869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 686 + ... + 1344.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2⁶⁶⁸⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

668885 is a deficient number, since it is larger than the sum of its proper divisors (281515).

668885 is a wasteful number, since it uses less digits than its factorization.

668885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its digits is 92160, while the sum is 41.

The square root of 668885 is about 817.8538989331. The cubic root of 668885 is about 87.4548338328.

The spelling of 668885 in words is "six hundred sixty-eight thousand, eight hundred eighty-five".