189981608920 has 128 divisors (see below), whose sum is σ = 457562701440. Its totient is φ = 70740541440.

The previous prime is 189981608917. The next prime is 189981608933. The reversal of 189981608920 is 29806189981.

It is a super-3 number, since 3×189981608920³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95323444 + ... + 95325436.

It is an arithmetic number, because the mean of its divisors is an integer number (3574708605).

Almost surely, 2^189981608920 is an apocalyptic number.

189981608920 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 189981608920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228781350720).

189981608920 is an abundant number, since it is smaller than the sum of its proper divisors (267581092520).

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

189981608920 is a wasteful number, since it uses less digits than its factorization.

189981608920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485 (or 3481 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 61.

The spelling of 189981608920 in words is "one hundred eighty-nine billion, nine hundred eighty-one million, six hundred eight thousand, nine hundred twenty".