28025320128 has 112 divisors (see below), whose sum is σ = 79915182816. Its totient is φ = 8616591360.

The previous prime is 28025320123. The next prime is 28025320139. The reversal of 28025320128 is 82102352082.

It is not an unprimeable number, because it can be changed into a prime (28025320123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4022568 + ... + 4029528.

It is an arithmetic number, because the mean of its divisors is an integer number (713528418).

Almost surely, 2^28025320128 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 28025320128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39957591408).

28025320128 is an abundant number, since it is smaller than the sum of its proper divisors (51889862688).

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

28025320128 is a wasteful number, since it uses less digits than its factorization.

28025320128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8602 (or 8592 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 28025320128 in words is "twenty-eight billion, twenty-five million, three hundred twenty thousand, one hundred twenty-eight".