18185142728 has 32 divisors (see below), whose sum is σ = 35833100160. Its totient is φ = 8641080000.

The previous prime is 18185142727. The next prime is 18185142733. The reversal of 18185142728 is 82724158181.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18185142721) 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 7 ways as a sum of consecutive naturals, for example, 701648 + ... + 727103.

It is an arithmetic number, because the mean of its divisors is an integer number (1119784380).

Almost surely, 2^18185142728 is an apocalyptic number.

It is an amenable number.

18185142728 is a deficient number, since it is larger than the sum of its proper divisors (17647957432).

18185142728 is a wasteful number, since it uses less digits than its factorization.

18185142728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428837 (or 1428833 counting only the distinct ones).

The product of its digits is 286720, while the sum is 47.

The spelling of 18185142728 in words is "eighteen billion, one hundred eighty-five million, one hundred forty-two thousand, seven hundred twenty-eight".