28080708128 has 54 divisors (see below), whose sum is σ = 60789167397. Its totient is φ = 12759218560.

The previous prime is 28080708127. The next prime is 28080708143. The reversal of 28080708128 is 82180708082.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 27852939664 + 227768464 = 166892^2 + 15092^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118492.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28080708127) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10425950 + ... + 10428642.

Almost surely, 2^28080708128 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 28080708128

28080708128 is an abundant number, since it is smaller than the sum of its proper divisors (32708459269).

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

28080708128 is an frugal number, since it uses more digits than its factorization.

With its successor (28080708129) it forms an eRAP, since the sums of their prime factors are consecutive (5418 and 5419).

28080708128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418 (or 2706 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 44.

The spelling of 28080708128 in words is "twenty-eight billion, eighty million, seven hundred eight thousand, one hundred twenty-eight".