188445564 has 18 divisors (see below), whose sum is σ = 476348600. Its totient is φ = 62815176.

The previous prime is 188445557. The next prime is 188445571. The reversal of 188445564 is 465544881.

It is a happy number.

188445564 is a `hidden beast` number, since 1 + 8 + 84 + 4 + 5 + 564 = 666.

It is an interprime number because it is at equal distance from previous prime (188445557) and next prime (188445571).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2617264 + ... + 2617335.

Almost surely, 2^188445564 is an apocalyptic number.

It is an amenable number.

188445564 is an abundant number, since it is smaller than the sum of its proper divisors (287903036).

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

188445564 is a wasteful number, since it uses less digits than its factorization.

188445564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5234609 (or 5234604 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The square root of 188445564 is about 13727.5476324069. The cubic root of 188445564 is about 573.3176422904.

The spelling of 188445564 in words is "one hundred eighty-eight million, four hundred forty-five thousand, five hundred sixty-four".