28530833885 has 4 divisors (see below), whose sum is σ = 34237000668. Its totient is φ = 22824667104.

The previous prime is 28530833843. The next prime is 28530833887. The reversal of 28530833885 is 58833803582.

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 17518640164 + 11012193721 = 132358^2 + 104939^2 .

It is a cyclic number.

It is not a de Polignac number, because 28530833885 - 2⁸ = 28530833629 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 (28530833887) 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, 2853083384 + ... + 2853083393.

It is an arithmetic number, because the mean of its divisors is an integer number (8559250167).

Almost surely, 2^28530833885 is an apocalyptic number.

It is an amenable number.

28530833885 is a deficient number, since it is larger than the sum of its proper divisors (5706166783).

28530833885 is an equidigital number, since it uses as much as digits as its factorization.

28530833885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706166782.

The product of its (nonzero) digits is 5529600, while the sum is 53.

The spelling of 28530833885 in words is "twenty-eight billion, five hundred thirty million, eight hundred thirty-three thousand, eight hundred eighty-five".