18315228736 has 112 divisors (see below), whose sum is σ = 43540801920. Its totient is φ = 7479521280.

The previous prime is 18315228731. The next prime is 18315228751. The reversal of 18315228736 is 63782251381.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (18315228731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 778230 + ... + 801418.

It is an arithmetic number, because the mean of its divisors is an integer number (388757160).

Almost surely, 2^18315228736 is an apocalyptic number.

18315228736 is a gapful number since it is divisible by the number (16) 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 18315228736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21770400960).

18315228736 is an abundant number, since it is smaller than the sum of its proper divisors (25225573184).

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

18315228736 is a wasteful number, since it uses less digits than its factorization.

18315228736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23292 (or 23282 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The spelling of 18315228736 in words is "eighteen billion, three hundred fifteen million, two hundred twenty-eight thousand, seven hundred thirty-six".