18528331072 has 56 divisors (see below), whose sum is σ = 38061671400. Its totient is φ = 8938438656.

The previous prime is 18528331057. The next prime is 18528331091. The reversal of 18528331072 is 27013382581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4437691456 + 14090639616 = 66616^2 + 118704^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696504 + ... + 3701512.

Almost surely, 2^18528331072 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 18528331072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19030835700).

18528331072 is an abundant number, since it is smaller than the sum of its proper divisors (19533340328).

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

18528331072 is a wasteful number, since it uses less digits than its factorization.

18528331072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043 (or 7033 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 18528331072 in words is "eighteen billion, five hundred twenty-eight million, three hundred thirty-one thousand, seventy-two".