28551725885 has 16 divisors (see below), whose sum is σ = 36156230400. Its totient is φ = 21584667456.

The previous prime is 28551725869. The next prime is 28551725893. The reversal of 28551725885 is 58852715582.

It is a cyclic number.

It is not a de Polignac number, because 28551725885 - 2⁴ = 28551725869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28551725885.

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, 340805 + ... + 416234.

It is an arithmetic number, because the mean of its divisors is an integer number (2259764400).

Almost surely, 2^28551725885 is an apocalyptic number.

It is an amenable number.

28551725885 is a deficient number, since it is larger than the sum of its proper divisors (7604504515).

28551725885 is a wasteful number, since it uses less digits than its factorization.

28551725885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757460.

The product of its digits is 8960000, while the sum is 56.

The spelling of 28551725885 in words is "twenty-eight billion, five hundred fifty-one million, seven hundred twenty-five thousand, eight hundred eighty-five".