668964 has 24 divisors (see below), whose sum is σ = 1578528. Its totient is φ = 220480.

The previous prime is 668963. The next prime is 668989. The reversal of 668964 is 469866.

It is not an unprimeable number, because it can be changed into a prime (668963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1024 + ... + 1544.

It is an arithmetic number, because the mean of its divisors is an integer number (65772).

2⁶⁶⁸⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

668964 is an abundant number, since it is smaller than the sum of its proper divisors (909564).

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

668964 is a wasteful number, since it uses less digits than its factorization.

668964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 633 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 668964 is about 817.9021946419. The cubic root of 668964 is about 87.4582767066.

The spelling of 668964 in words is "six hundred sixty-eight thousand, nine hundred sixty-four".