18889120000 has 90 divisors (see below), whose sum is σ = 47115885278. Its totient is φ = 7555584000.

The previous prime is 18889119989. The next prime is 18889120007. The reversal of 18889120000 is 2198881.

It can be written as a sum of positive squares in 5 ways, for example, as 3536918784 + 15352201216 = 59472^2 + 123904^2 .

It is not an unprimeable number, because it can be changed into a prime (18889120007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 100972 + ... + 219028.

Almost surely, 2^18889120000 is an apocalyptic number.

18889120000 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 18889120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23557942639).

18889120000 is an abundant number, since it is smaller than the sum of its proper divisors (28226765278).

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

18889120000 is an frugal number, since it uses more digits than its factorization.

18889120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118093 (or 118064 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The spelling of 18889120000 in words is "eighteen billion, eight hundred eighty-nine million, one hundred twenty thousand".