28111215232 has 32 divisors (see below), whose sum is σ = 59297099220. Its totient is φ = 13228806144.

The previous prime is 28111215229. The next prime is 28111215257. The reversal of 28111215232 is 23251211182.

It can be written as a sum of positive squares in 2 ways, for example, as 26522076736 + 1589138496 = 162856^2 + 39864^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 28111215232.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6457203 + ... + 6461554.

Almost surely, 2^28111215232 is an apocalyptic number.

It is an amenable number.

28111215232 is an abundant number, since it is smaller than the sum of its proper divisors (31185883988).

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

28111215232 is a wasteful number, since it uses less digits than its factorization.

28111215232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12918788 (or 12918776 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The spelling of 28111215232 in words is "twenty-eight billion, one hundred eleven million, two hundred fifteen thousand, two hundred thirty-two".