18789859872 has 576 divisors, whose sum is σ = 66924748800. Its totient is φ = 5107898880.

The previous prime is 18789859871. The next prime is 18789859883. The reversal of 18789859872 is 27895898781.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 18789859872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18789859871) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 135178779 + ... + 135178917.

It is an arithmetic number, because the mean of its divisors is an integer number (116188800).

Almost surely, 2^18789859872 is an apocalyptic number.

18789859872 is a gapful number since it is divisible by the number (12) 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 18789859872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33462374400).

18789859872 is an abundant number, since it is smaller than the sum of its proper divisors (48134888928).

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

18789859872 is a wasteful number, since it uses less digits than its factorization.

18789859872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 285 counting only the distinct ones).

The product of its digits is 162570240, while the sum is 72.

The spelling of 18789859872 in words is "eighteen billion, seven hundred eighty-nine million, eight hundred fifty-nine thousand, eight hundred seventy-two".