18235372320 has 384 divisors, whose sum is σ = 73724878080. Its totient is φ = 4160471040.

The previous prime is 18235372319. The next prime is 18235372483. The reversal of 18235372320 is 2327353281.

18235372320 is a `hidden beast` number, since 1 + 82 + 3 + 537 + 23 + 20 = 666.

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

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 63 ways as a sum of consecutive naturals, for example, 796554 + ... + 819126.

It is an arithmetic number, because the mean of its divisors is an integer number (191991870).

Almost surely, 2^18235372320 is an apocalyptic number.

18235372320 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 18235372320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36862439040).

18235372320 is an abundant number, since it is smaller than the sum of its proper divisors (55489505760).

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

18235372320 is a wasteful number, since it uses less digits than its factorization.

18235372320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22625 (or 22611 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 18235372320 in words is "eighteen billion, two hundred thirty-five million, three hundred seventy-two thousand, three hundred twenty".