668388 has 48 divisors (see below), whose sum is σ = 1823360. Its totient is φ = 186624.

The previous prime is 668347. The next prime is 668407. The reversal of 668388 is 883866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6078 + ... + 6186.

2⁶⁶⁸³⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911680).

668388 is an abundant number, since it is smaller than the sum of its proper divisors (1154972).

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

668388 is a wasteful number, since it uses less digits than its factorization.

668388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 194 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 668388 is about 817.5499984710. The cubic root of 668388 is about 87.4331680147.

The spelling of 668388 in words is "six hundred sixty-eight thousand, three hundred eighty-eight".