28123572912 has 80 divisors (see below), whose sum is σ = 77078876160. Its totient is φ = 8811161856.

The previous prime is 28123572871. The next prime is 28123572929. The reversal of 28123572912 is 21927532182.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5583 + ... + 237230.

It is an arithmetic number, because the mean of its divisors is an integer number (963485952).

Almost surely, 2^28123572912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28123572912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38539438080).

28123572912 is an abundant number, since it is smaller than the sum of its proper divisors (48955303248).

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

28123572912 is a wasteful number, since it uses less digits than its factorization.

28123572912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242970 (or 242964 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The spelling of 28123572912 in words is "twenty-eight billion, one hundred twenty-three million, five hundred seventy-two thousand, nine hundred twelve".