188638564 has 12 divisors (see below), whose sum is σ = 330220800. Its totient is φ = 94289768.

The previous prime is 188638553. The next prime is 188638573. The reversal of 188638564 is 465836881.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13677 + ... + 23755.

It is an arithmetic number, because the mean of its divisors is an integer number (27518400).

Almost surely, 2^188638564 is an apocalyptic number.

It is an amenable number.

188638564 is a deficient number, since it is larger than the sum of its proper divisors (141582236).

188638564 is a wasteful number, since it uses less digits than its factorization.

188638564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14762 (or 14760 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 188638564 is about 13734.5754939860. The cubic root of 188638564 is about 573.5133001225.

The spelling of 188638564 in words is "one hundred eighty-eight million, six hundred thirty-eight thousand, five hundred sixty-four".