189971568 has 160 divisors (see below), whose sum is σ = 567374400. Its totient is φ = 61585920.

The previous prime is 189971567. The next prime is 189971581. The reversal of 189971568 is 865179981.

189971568 is a `hidden beast` number, since 1 + 8 + 9 + 9 + 71 + 568 = 666.

189971568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189971567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2134468 + ... + 2134556.

It is an arithmetic number, because the mean of its divisors is an integer number (3546090).

Almost surely, 2^189971568 is an apocalyptic number.

189971568 is a gapful number since it is divisible by the number (18) 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 189971568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283687200).

189971568 is an abundant number, since it is smaller than the sum of its proper divisors (377402832).

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

189971568 is an frugal number, since it uses more digits than its factorization.

189971568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 155 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 189971568 is about 13783.0173764673. The cubic root of 189971568 is about 574.8610305619.

The spelling of 189971568 in words is "one hundred eighty-nine million, nine hundred seventy-one thousand, five hundred sixty-eight".