18033672728 has 16 divisors (see below), whose sum is σ = 34451120880. Its totient is φ = 8846707168.

The previous prime is 18033672617. The next prime is 18033672733. The reversal of 18033672728 is 82727633081.

It is a super-2 number, since 2×18033672728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21265700 + ... + 21266547.

It is an arithmetic number, because the mean of its divisors is an integer number (2153195055).

Almost surely, 2^18033672728 is an apocalyptic number.

It is an amenable number.

18033672728 is a deficient number, since it is larger than the sum of its proper divisors (16417448152).

18033672728 is a wasteful number, since it uses less digits than its factorization.

18033672728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42532306 (or 42532302 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 18033672728 in words is "eighteen billion, thirty-three million, six hundred seventy-two thousand, seven hundred twenty-eight".