18508730688 has 672 divisors, whose sum is σ = 67979568384. Its totient is φ = 4873125888.

The previous prime is 18508730677. The next prime is 18508730693. The reversal of 18508730688 is 88603780581.

It is a happy number.

18508730688 is a `hidden beast` number, since 1 + 8 + 508 + 73 + 0 + 68 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a super-2 number, since 2×18508730688² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 135100156 + ... + 135100292.

It is an arithmetic number, because the mean of its divisors is an integer number (101160072).

Almost surely, 2^18508730688 is an apocalyptic number.

18508730688 is a gapful number since it is divisible by the number (18) 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 18508730688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33989784192).

18508730688 is an abundant number, since it is smaller than the sum of its proper divisors (49470837696).

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

18508730688 is a wasteful number, since it uses less digits than its factorization.

18508730688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 18508730688 in words is "eighteen billion, five hundred eight million, seven hundred thirty thousand, six hundred eighty-eight".