18097859728 has 240 divisors, whose sum is σ = 42124526080. Its totient is φ = 7478894592.

The previous prime is 18097859723. The next prime is 18097859783. The reversal of 18097859728 is 82795879081.

It is a self number, because there is not a number n which added to its sum of digits gives 18097859728.

It is not an unprimeable number, because it can be changed into a prime (18097859723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 175707325 + ... + 175707427.

Almost surely, 2^18097859728 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 18097859728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21062263040).

18097859728 is an abundant number, since it is smaller than the sum of its proper divisors (24026666352).

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

18097859728 is a wasteful number, since it uses less digits than its factorization.

18097859728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 64.

The spelling of 18097859728 in words is "eighteen billion, ninety-seven million, eight hundred fifty-nine thousand, seven hundred twenty-eight".