18000045000028 has 192 divisors, whose sum is σ = 39252239488000. Its totient is φ = 7074773072640.

The previous prime is 18000045000001. The next prime is 18000045000061. The reversal of 18000045000028 is 82000054000081.

18000045000028 is a nontrivial binomial coefficient, being equal to C(6000008, 2).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6591007423 + ... + 6591010153.

Almost surely, 2^{18000045000028} is an apocalyptic number.

18000045000028 is the 6000007-th triangular number and also the 3000004-th hexagonal number.

18000045000028 is the 2000003-rd centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18000045000028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19626119744000).

18000045000028 is an abundant number, since it is smaller than the sum of its proper divisors (21252194487972).

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

18000045000028 is a wasteful number, since it uses less digits than its factorization.

18000045000028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437 (or 3409 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The spelling of 18000045000028 in words is "eighteen trillion, forty-five million, twenty-eight", and thus it is an aban number and an uban number.