18215528720 has 160 divisors (see below), whose sum is σ = 44517150720. Its totient is φ = 6922782720.

The previous prime is 18215528717. The next prime is 18215528759. The reversal of 18215528720 is 2782551281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62168894 + ... + 62169186.

It is an arithmetic number, because the mean of its divisors is an integer number (278232192).

Almost surely, 2^18215528720 is an apocalyptic number.

18215528720 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 18215528720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22258575360).

18215528720 is an abundant number, since it is smaller than the sum of its proper divisors (26301622000).

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

18215528720 is a wasteful number, since it uses less digits than its factorization.

18215528720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 41.

The spelling of 18215528720 in words is "eighteen billion, two hundred fifteen million, five hundred twenty-eight thousand, seven hundred twenty".