18236719872 has 432 divisors, whose sum is σ = 63272821248. Its totient is φ = 4939038720.

The previous prime is 18236719867. The next prime is 18236719901. The reversal of 18236719872 is 27891763281.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78269068 + ... + 78269300.

It is an arithmetic number, because the mean of its divisors is an integer number (146464864).

Almost surely, 2^18236719872 is an apocalyptic number.

18236719872 is a gapful number since it is divisible by the number (12) 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 18236719872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31636410624).

18236719872 is an abundant number, since it is smaller than the sum of its proper divisors (45036101376).

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

18236719872 is a wasteful number, since it uses less digits than its factorization.

18236719872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 479 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 18236719872 in words is "eighteen billion, two hundred thirty-six million, seven hundred nineteen thousand, eight hundred seventy-two".