668464 has 20 divisors (see below), whose sum is σ = 1328040. Its totient is φ = 325760.

The previous prime is 668417. The next prime is 668471. The reversal of 668464 is 464866.

It is an Ulam number.

It is a nialpdrome in base 16.

It is an unprimeable number.

668464 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, 147 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (66402).

2⁶⁶⁸⁴⁶⁴ is an apocalyptic number.

It is an amenable number.

668464 is a deficient number, since it is larger than the sum of its proper divisors (659576).

668464 is a wasteful number, since it uses less digits than its factorization.

668464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1062 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 668464 is about 817.5964774875. The cubic root of 668464 is about 87.4364817930.

The spelling of 668464 in words is "six hundred sixty-eight thousand, four hundred sixty-four".