188664 has 32 divisors (see below), whose sum is σ = 539520. Its totient is φ = 53856.

The previous prime is 188653. The next prime is 188677. The reversal of 188664 is 466881.

188664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

188664 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 7 ways as a sum of consecutive naturals, for example, 394 + ... + 729.

It is an arithmetic number, because the mean of its divisors is an integer number (16860).

2¹⁸⁸⁶⁶⁴ is an apocalyptic number.

188664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

188664 is an abundant number, since it is smaller than the sum of its proper divisors (350856).

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

188664 is a wasteful number, since it uses less digits than its factorization.

188664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1135 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 188664 is about 434.3546937700. The cubic root of 188664 is about 57.3539076451.

The spelling of 188664 in words is "one hundred eighty-eight thousand, six hundred sixty-four".