28172082138 has 8 divisors (see below), whose sum is σ = 56344164288. Its totient is φ = 9390694044.

The previous prime is 28172082091. The next prime is 28172082157. The reversal of 28172082138 is 83128027182.

28172082138 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

28172082138 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28172082138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2347673506 + ... + 2347673517.

It is an arithmetic number, because the mean of its divisors is an integer number (7043020536).

Almost surely, 2^28172082138 is an apocalyptic number.

28172082138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28172082138 is a wasteful number, since it uses less digits than its factorization.

28172082138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695347028.

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 28172082138 in words is "twenty-eight billion, one hundred seventy-two million, eighty-two thousand, one hundred thirty-eight".