18307336320 has 768 divisors, whose sum is σ = 79394515200. Its totient is φ = 3784015872.

The previous prime is 18307336319. The next prime is 18307336343. The reversal of 18307336320 is 2363370381.

It is a happy number.

18307336320 is a `hidden beast` number, since 18 + 3 + 0 + 7 + 3 + 3 + 632 + 0 = 666.

It is a super-2 number, since 2×18307336320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 27780151 + ... + 27780809.

It is an arithmetic number, because the mean of its divisors is an integer number (103378275).

Almost surely, 2^18307336320 is an apocalyptic number.

18307336320 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 18307336320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39697257600).

18307336320 is an abundant number, since it is smaller than the sum of its proper divisors (61087178880).

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

18307336320 is a wasteful number, since it uses less digits than its factorization.

18307336320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The spelling of 18307336320 in words is "eighteen billion, three hundred seven million, three hundred thirty-six thousand, three hundred twenty".