188321664 has 32 divisors (see below), whose sum is σ = 500230440. Its totient is φ = 62773760.

The previous prime is 188321591. The next prime is 188321713. The reversal of 188321664 is 466123881.

It is a tau number, because it is divible by the number of its divisors (32).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244827 + ... + 245594.

Almost surely, 2^188321664 is an apocalyptic number.

It is an amenable number.

188321664 is an abundant number, since it is smaller than the sum of its proper divisors (311908776).

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

188321664 is an equidigital number, since it uses as much as digits as its factorization.

188321664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490438 (or 490426 counting only the distinct ones).

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

The square root of 188321664 is about 13723.0340668527. The cubic root of 188321664 is about 573.1919656263.

The spelling of 188321664 in words is "one hundred eighty-eight million, three hundred twenty-one thousand, six hundred sixty-four".