189564720 has 80 divisors (see below), whose sum is σ = 589938432. Its totient is φ = 50353920.

The previous prime is 189564719. The next prime is 189564737. The reversal of 189564720 is 27465981.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66525 + ... + 69315.

Almost surely, 2^189564720 is an apocalyptic number.

189564720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189564720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294969216).

189564720 is an abundant number, since it is smaller than the sum of its proper divisors (400373712).

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

189564720 is a wasteful number, since it uses less digits than its factorization.

189564720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 189564720 is about 13768.2504335155. The cubic root of 189564720 is about 574.4503581933.

The spelling of 189564720 in words is "one hundred eighty-nine million, five hundred sixty-four thousand, seven hundred twenty".