18082172028 has 24 divisors (see below), whose sum is σ = 42906850560. Its totient is φ = 5925231280.

The previous prime is 18082172027. The next prime is 18082172033. The reversal of 18082172028 is 82027128081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18082172027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12769188 + ... + 12770603.

It is an arithmetic number, because the mean of its divisors is an integer number (1787785440).

Almost surely, 2^18082172028 is an apocalyptic number.

It is an amenable number.

18082172028 is an abundant number, since it is smaller than the sum of its proper divisors (24824678532).

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

18082172028 is a wasteful number, since it uses less digits than its factorization.

18082172028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25539857 (or 25539855 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 39.

The spelling of 18082172028 in words is "eighteen billion, eighty-two million, one hundred seventy-two thousand, twenty-eight".