28126984172 has 48 divisors (see below), whose sum is σ = 59234192640. Its totient is φ = 11416220352.

The previous prime is 28126984159. The next prime is 28126984189. The reversal of 28126984172 is 27148962182.

It is a super-2 number, since 2×28126984172² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28126984172.

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 15 ways as a sum of consecutive naturals, for example, 2080298 + ... + 2093774.

It is an arithmetic number, because the mean of its divisors is an integer number (1234045680).

Almost surely, 2^28126984172 is an apocalyptic number.

It is an amenable number.

28126984172 is an abundant number, since it is smaller than the sum of its proper divisors (31107208468).

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

28126984172 is a wasteful number, since it uses less digits than its factorization.

28126984172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17430 (or 17428 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The spelling of 28126984172 in words is "twenty-eight billion, one hundred twenty-six million, nine hundred eighty-four thousand, one hundred seventy-two".