28712224188 has 72 divisors (see below), whose sum is σ = 76919274432. Its totient is φ = 8999334912.

The previous prime is 28712224169. The next prime is 28712224231. The reversal of 28712224188 is 88142221782.

28712224188 is a `hidden beast` number, since 2 + 8 + 7 + 1 + 222 + 418 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649981 + ... + 692747.

It is an arithmetic number, because the mean of its divisors is an integer number (1068323256).

Almost surely, 2^28712224188 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 28712224188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38459637216).

28712224188 is an abundant number, since it is smaller than the sum of its proper divisors (48207050244).

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

28712224188 is a wasteful number, since it uses less digits than its factorization.

28712224188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43891 (or 43886 counting only the distinct ones).

The product of its digits is 229376, while the sum is 45.

The spelling of 28712224188 in words is "twenty-eight billion, seven hundred twelve million, two hundred twenty-four thousand, one hundred eighty-eight".