18215883728 has 80 divisors (see below), whose sum is σ = 41403778560. Its totient is φ = 7602469248.

The previous prime is 18215883703. The next prime is 18215883733. The reversal of 18215883728 is 82738851281.

It is a super-3 number, since 3×18215883728³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18215883728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694175 + ... + 719937.

It is an arithmetic number, because the mean of its divisors is an integer number (517547232).

Almost surely, 2^18215883728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18215883728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20701889280).

18215883728 is an abundant number, since it is smaller than the sum of its proper divisors (23187894832).

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

18215883728 is a wasteful number, since it uses less digits than its factorization.

18215883728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25944 (or 25938 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 53.

The spelling of 18215883728 in words is "eighteen billion, two hundred fifteen million, eight hundred eighty-three thousand, seven hundred twenty-eight".