668312 has 16 divisors (see below), whose sum is σ = 1264200. Its totient is φ = 331200.

The previous prime is 668303. The next prime is 668347. The reversal of 668312 is 213866.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812 + ... + 1412.

2⁶⁶⁸³¹² is an apocalyptic number.

It is an amenable number.

668312 is a deficient number, since it is larger than the sum of its proper divisors (595888).

668312 is a wasteful number, since it uses less digits than its factorization.

668312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 668312 is about 817.5035168120. The cubic root of 668312 is about 87.4298539852.

The spelling of 668312 in words is "six hundred sixty-eight thousand, three hundred twelve".