28575188885 has 4 divisors (see below), whose sum is σ = 34290226668. Its totient is φ = 22860151104.

The previous prime is 28575188881. The next prime is 28575188899. The reversal of 28575188885 is 58888157582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5497629316 + 23077559569 = 74146^2 + 151913^2 .

It is a cyclic number.

It is not a de Polignac number, because 28575188885 - 2² = 28575188881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28575188881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2857518884 + ... + 2857518893.

It is an arithmetic number, because the mean of its divisors is an integer number (8572556667).

Almost surely, 2^28575188885 is an apocalyptic number.

It is an amenable number.

28575188885 is a deficient number, since it is larger than the sum of its proper divisors (5715037783).

28575188885 is an equidigital number, since it uses as much as digits as its factorization.

28575188885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715037782.

The product of its digits is 57344000, while the sum is 65.

The spelling of 28575188885 in words is "twenty-eight billion, five hundred seventy-five million, one hundred eighty-eight thousand, eight hundred eighty-five".