28172876328 has 160 divisors (see below), whose sum is σ = 79995253800. Its totient is φ = 9262522368.

The previous prime is 28172876311. The next prime is 28172876339. The reversal of 28172876328 is 82367827182.

28172876328 is a `hidden beast` number, since 28 + 17 + 287 + 6 + 328 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19808310564 + 8364565764 = 140742^2 + 91458^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24953268 + ... + 24954396.

Almost surely, 2^28172876328 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 28172876328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39997626900).

28172876328 is an abundant number, since it is smaller than the sum of its proper divisors (51822377472).

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

28172876328 is a wasteful number, since it uses less digits than its factorization.

28172876328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641 (or 1628 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 28172876328 in words is "twenty-eight billion, one hundred seventy-two million, eight hundred seventy-six thousand, three hundred twenty-eight".