18224518720 has 112 divisors (see below), whose sum is σ = 46107797040. Its totient is φ = 6848077824.

The previous prime is 18224518643. The next prime is 18224518723. The reversal of 18224518720 is 2781542281.

It can be written as a sum of positive squares in 8 ways, for example, as 424689664 + 17799829056 = 20608^2 + 133416^2 .

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 (18224518723) 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, 316822 + ... + 369898.

Almost surely, 2^18224518720 is an apocalyptic number.

18224518720 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 18224518720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23053898520).

18224518720 is an abundant number, since it is smaller than the sum of its proper divisors (27883278320).

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

18224518720 is a wasteful number, since it uses less digits than its factorization.

18224518720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53160 (or 53150 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 18224518720 in words is "eighteen billion, two hundred twenty-four million, five hundred eighteen thousand, seven hundred twenty".