18363877728 has 96 divisors (see below), whose sum is σ = 55396373760. Its totient is φ = 5217799680.

The previous prime is 18363877691. The next prime is 18363877747. The reversal of 18363877728 is 82777836381.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46143 + ... + 197121.

It is an arithmetic number, because the mean of its divisors is an integer number (577045560).

Almost surely, 2^18363877728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18363877728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27698186880).

18363877728 is an abundant number, since it is smaller than the sum of its proper divisors (37032496032).

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

18363877728 is a wasteful number, since it uses less digits than its factorization.

18363877728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151180 (or 151172 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 60.

The spelling of 18363877728 in words is "eighteen billion, three hundred sixty-three million, eight hundred seventy-seven thousand, seven hundred twenty-eight".