28187173688 has 16 divisors (see below), whose sum is σ = 52854103680. Its totient is φ = 14092746048.

The previous prime is 28187173687. The next prime is 28187173717. The reversal of 28187173688 is 88637178182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187173687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51020 + ... + 242852.

It is an arithmetic number, because the mean of its divisors is an integer number (3303381480).

Almost surely, 2^28187173688 is an apocalyptic number.

It is an amenable number.

28187173688 is a deficient number, since it is larger than the sum of its proper divisors (24666929992).

28187173688 is a wasteful number, since it uses less digits than its factorization.

28187173688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210206 (or 210202 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 59.

The spelling of 28187173688 in words is "twenty-eight billion, one hundred eighty-seven million, one hundred seventy-three thousand, six hundred eighty-eight".