668188 has 6 divisors (see below), whose sum is σ = 1169336. Its totient is φ = 334092.

The previous prime is 668179. The next prime is 668201. The reversal of 668188 is 881866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83520 + ... + 83527.

2⁶⁶⁸¹⁸⁸ is an apocalyptic number.

It is an amenable number.

668188 is a deficient number, since it is larger than the sum of its proper divisors (501148).

668188 is a wasteful number, since it uses less digits than its factorization.

668188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167051 (or 167049 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 668188 is about 817.4276726414. The cubic root of 668188 is about 87.4244463451.

The spelling of 668188 in words is "six hundred sixty-eight thousand, one hundred eighty-eight".