18044311328 has 24 divisors (see below), whose sum is σ = 36749730780. Its totient is φ = 8711046400.

The previous prime is 18044311289. The next prime is 18044311403. The reversal of 18044311328 is 82311344081.

It can be written as a sum of positive squares in 2 ways, for example, as 17607166864 + 437144464 = 132692^2 + 20908^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9721223 + ... + 9723078.

Almost surely, 2^18044311328 is an apocalyptic number.

It is an amenable number.

18044311328 is an abundant number, since it is smaller than the sum of its proper divisors (18705419452).

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

18044311328 is a wasteful number, since it uses less digits than its factorization.

18044311328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19444340 (or 19444332 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 18044311328 in words is "eighteen billion, forty-four million, three hundred eleven thousand, three hundred twenty-eight".