18039122728 has 64 divisors (see below), whose sum is σ = 38868984000. Its totient is φ = 7762291200.

The previous prime is 18039122719. The next prime is 18039122729. The reversal of 18039122728 is 82722193081.

It is not an unprimeable number, because it can be changed into a prime (18039122729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2874378 + ... + 2880646.

It is an arithmetic number, because the mean of its divisors is an integer number (607327875).

Almost surely, 2^18039122728 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 18039122728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19434492000).

18039122728 is an abundant number, since it is smaller than the sum of its proper divisors (20829861272).

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

18039122728 is a wasteful number, since it uses less digits than its factorization.

18039122728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8026 (or 8022 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 18039122728 in words is "eighteen billion, thirty-nine million, one hundred twenty-two thousand, seven hundred twenty-eight".