28201132544 has 80 divisors (see below), whose sum is σ = 60741950808. Its totient is φ = 13002964992.

The previous prime is 28201132457. The next prime is 28201132607. The reversal of 28201132544 is 44523110282.

It can be written as a sum of positive squares in 4 ways, for example, as 16037689600 + 12163442944 = 126640^2 + 110288^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 28201132544.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11027714 + ... + 11030270.

Almost surely, 2^28201132544 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 28201132544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30370975404).

28201132544 is an abundant number, since it is smaller than the sum of its proper divisors (32540818264).

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

28201132544 is a wasteful number, since it uses less digits than its factorization.

28201132544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245 (or 4229 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The spelling of 28201132544 in words is "twenty-eight billion, two hundred one million, one hundred thirty-two thousand, five hundred forty-four".