18250739728 has 20 divisors (see below), whose sum is σ = 38080870828. Its totient is φ = 8423418240.

The previous prime is 18250739653. The next prime is 18250739747. The reversal of 18250739728 is 82793705281.

It can be written as a sum of positive squares in 2 ways, for example, as 5650228224 + 12600511504 = 75168^2 + 112252^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 43871763 + ... + 43872178.

Almost surely, 2^18250739728 is an apocalyptic number.

It is an amenable number.

18250739728 is an abundant number, since it is smaller than the sum of its proper divisors (19830131100).

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

18250739728 is a wasteful number, since it uses less digits than its factorization.

18250739728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87743962 (or 87743956 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 18250739728 in words is "eighteen billion, two hundred fifty million, seven hundred thirty-nine thousand, seven hundred twenty-eight".