28125721584 has 80 divisors (see below), whose sum is σ = 84980275200. Its totient is φ = 8881804224.

The previous prime is 28125721579. The next prime is 28125721597. The reversal of 28125721584 is 48512752182.

28125721584 is a `hidden beast` number, since 2 + 8 + 12 + 57 + 2 + 1 + 584 = 666.

It is a congruent number.

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, 1705104 + ... + 1721519.

It is an arithmetic number, because the mean of its divisors is an integer number (1062253440).

Almost surely, 2^28125721584 is an apocalyptic number.

28125721584 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28125721584 is an abundant number, since it is smaller than the sum of its proper divisors (56854553616).

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

28125721584 is a wasteful number, since it uses less digits than its factorization.

28125721584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426659 (or 3426647 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The spelling of 28125721584 in words is "twenty-eight billion, one hundred twenty-five million, seven hundred twenty-one thousand, five hundred eighty-four".