668866 has 8 divisors (see below), whose sum is σ = 1094544. Its totient is φ = 304020.

The previous prime is 668851. The next prime is 668867.

668866 is nontrivially palindromic in base 10.

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

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (668867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15180 + ... + 15223.

It is an arithmetic number, because the mean of its divisors is an integer number (136818).

2⁶⁶⁸⁸⁶⁶ is an apocalyptic number.

668866 is a deficient number, since it is larger than the sum of its proper divisors (425678).

668866 is a wasteful number, since it uses less digits than its factorization.

668866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30416.

The product of its digits is 82944, while the sum is 40.

The square root of 668866 is about 817.8422830840. The cubic root of 668866 is about 87.4540057594.

The spelling of 668866 in words is "six hundred sixty-eight thousand, eight hundred sixty-six".