28120068872 has 16 divisors (see below), whose sum is σ = 60257290560. Its totient is φ = 12051458064.

The previous prime is 28120068869. The next prime is 28120068877. The reversal of 28120068872 is 27886002182.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28120068877) 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, 251071988 + ... + 251072099.

It is an arithmetic number, because the mean of its divisors is an integer number (3766080660).

Almost surely, 2^28120068872 is an apocalyptic number.

It is an amenable number.

28120068872 is an abundant number, since it is smaller than the sum of its proper divisors (32137221688).

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

28120068872 is a wasteful number, since it uses less digits than its factorization.

28120068872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502144100 (or 502144096 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 44.

The spelling of 28120068872 in words is "twenty-eight billion, one hundred twenty million, sixty-eight thousand, eight hundred seventy-two".