28897131472 has 80 divisors (see below), whose sum is σ = 61464976704. Its totient is φ = 13052160000.

The previous prime is 28897131469. The next prime is 28897131509. The reversal of 28897131472 is 27413179882.

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, 23360038 + ... + 23361274.

Almost surely, 2^28897131472 is an apocalyptic number.

28897131472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28897131472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30732488352).

28897131472 is an abundant number, since it is smaller than the sum of its proper divisors (32567845232).

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

28897131472 is a wasteful number, since it uses less digits than its factorization.

28897131472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988 (or 1982 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 52.

The spelling of 28897131472 in words is "twenty-eight billion, eight hundred ninety-seven million, one hundred thirty-one thousand, four hundred seventy-two".