18106728250 has 64 divisors (see below), whose sum is σ = 36636765984. Its totient is φ = 6661094400.

The previous prime is 18106728209. The next prime is 18106728251. The reversal of 18106728250 is 5282760181.

It can be written as a sum of positive squares in 16 ways, for example, as 10300829049 + 7805899201 = 101493^2 + 88351^2 .

It is not an unprimeable number, because it can be changed into a prime (18106728251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 890194 + ... + 910306.

Almost surely, 2^18106728250 is an apocalyptic number.

18106728250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18106728250 is an abundant number, since it is smaller than the sum of its proper divisors (18530037734).

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

18106728250 is a wasteful number, since it uses less digits than its factorization.

18106728250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20420 (or 20410 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 18106728250 in words is "eighteen billion, one hundred six million, seven hundred twenty-eight thousand, two hundred fifty".