18363729720 has 128 divisors (see below), whose sum is σ = 62993111040. Its totient is φ = 4195307520.

The previous prime is 18363729679. The next prime is 18363729721. The reversal of 18363729720 is 2792736381.

It is a super-2 number, since 2×18363729720² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18363729720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363729721) 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 31 ways as a sum of consecutive naturals, for example, 2173905 + ... + 2182335.

It is an arithmetic number, because the mean of its divisors is an integer number (492133680).

Almost surely, 2^18363729720 is an apocalyptic number.

18363729720 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 18363729720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31496555520).

18363729720 is an abundant number, since it is smaller than the sum of its proper divisors (44629381320).

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

18363729720 is a wasteful number, since it uses less digits than its factorization.

18363729720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11045 (or 11041 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 18363729720 in words is "eighteen billion, three hundred sixty-three million, seven hundred twenty-nine thousand, seven hundred twenty".