28515568256 has 128 divisors (see below), whose sum is σ = 69129365760. Its totient is φ = 11437424640.

The previous prime is 28515568241. The next prime is 28515568261. The reversal of 28515568256 is 65286551582.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 28515568198 and 28515568207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2751821 + ... + 2762163.

It is an arithmetic number, because the mean of its divisors is an integer number (540073170).

Almost surely, 2^28515568256 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 28515568256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34564682880).

28515568256 is an abundant number, since it is smaller than the sum of its proper divisors (40613797504).

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

28515568256 is a wasteful number, since it uses less digits than its factorization.

28515568256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562 (or 10550 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 53.

The spelling of 28515568256 in words is "twenty-eight billion, five hundred fifteen million, five hundred sixty-eight thousand, two hundred fifty-six".