18015884320 has 96 divisors (see below), whose sum is σ = 48700649088. Its totient is φ = 6169540608.

The previous prime is 18015884311. The next prime is 18015884323. The reversal of 18015884320 is 2348851081.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (18015884323) 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, 979852 + ... + 998068.

It is an arithmetic number, because the mean of its divisors is an integer number (507298428).

Almost surely, 2^18015884320 is an apocalyptic number.

18015884320 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 18015884320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24350324544).

18015884320 is an abundant number, since it is smaller than the sum of its proper divisors (30684764768).

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

18015884320 is a wasteful number, since it uses less digits than its factorization.

18015884320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19122 (or 19114 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 18015884320 in words is "eighteen billion, fifteen million, eight hundred eighty-four thousand, three hundred twenty".