188888890920 has 256 divisors, whose sum is σ = 598139942400. Its totient is φ = 47656304640.

The previous prime is 188888890909. The next prime is 188888890951. The reversal of 188888890920 is 29098888881.

It is a super-2 number, since 2×188888890920² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 61345941 + ... + 61349019.

It is an arithmetic number, because the mean of its divisors is an integer number (2336484150).

Almost surely, 2^188888890920 is an apocalyptic number.

188888890920 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 188888890920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299069971200).

188888890920 is an abundant number, since it is smaller than the sum of its proper divisors (409251051480).

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

188888890920 is a wasteful number, since it uses less digits than its factorization.

188888890920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508 (or 3504 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 69.

The spelling of 188888890920 in words is "one hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred ninety thousand, nine hundred twenty".