668886 has 32 divisors (see below), whose sum is σ = 1444608. Its totient is φ = 205920.

The previous prime is 668879. The next prime is 668903. The reversal of 668886 is 688866.

668886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668886.

It is an unprimeable number.

668886 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5041 + ... + 5171.

It is an arithmetic number, because the mean of its divisors is an integer number (45144).

2⁶⁶⁸⁸⁸⁶ is an apocalyptic number.

668886 is an abundant number, since it is smaller than the sum of its proper divisors (775722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668886 is a wasteful number, since it uses less digits than its factorization.

668886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196.

The product of its digits is 110592, while the sum is 42.

The square root of 668886 is about 817.8545102890. The cubic root of 668886 is about 87.4548774152.

The spelling of 668886 in words is "six hundred sixty-eight thousand, eight hundred eighty-six".