189721835072 has 112 divisors (see below), whose sum is σ = 470006037888. Its totient is φ = 73818501120.

The previous prime is 189721835029. The next prime is 189721835077. The reversal of 189721835072 is 270538127981.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (189721835077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3705068 + ... + 3755924.

Almost surely, 2^189721835072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189721835072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235003018944).

189721835072 is an abundant number, since it is smaller than the sum of its proper divisors (280284202816).

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

189721835072 is a wasteful number, since it uses less digits than its factorization.

189721835072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51644 (or 51634 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 189721835072 in words is "one hundred eighty-nine billion, seven hundred twenty-one million, eight hundred thirty-five thousand, seventy-two".