668912 has 20 divisors (see below), whose sum is σ = 1312416. Its totient is φ = 330240.

The previous prime is 668903. The next prime is 668929. The reversal of 668912 is 219866.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

668912 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 3 ways as a sum of consecutive naturals, for example, 1337 + ... + 1767.

2⁶⁶⁸⁹¹² is an apocalyptic number.

It is an amenable number.

668912 is a deficient number, since it is larger than the sum of its proper divisors (643504).

668912 is a wasteful number, since it uses less digits than its factorization.

668912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 530 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 668912 is about 817.8704053822. The cubic root of 668912 is about 87.4560105417.

The spelling of 668912 in words is "six hundred sixty-eight thousand, nine hundred twelve".