28832825221 has 4 divisors (see below), whose sum is σ = 28833633612. Its totient is φ = 28832016832.

The previous prime is 28832825213. The next prime is 28832825233. The reversal of 28832825221 is 12252823882.

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 18957434596 + 9875390625 = 137686^2 + 99375^2 .

It is a cyclic number.

It is not a de Polignac number, because 28832825221 - 2³ = 28832825213 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 (28832825201) 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, 348100 + ... + 422893.

It is an arithmetic number, because the mean of its divisors is an integer number (7208408403).

Almost surely, 2^28832825221 is an apocalyptic number.

It is an amenable number.

28832825221 is a deficient number, since it is larger than the sum of its proper divisors (808391).

28832825221 is an equidigital number, since it uses as much as digits as its factorization.

28832825221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808390.

The product of its digits is 245760, while the sum is 43.

The spelling of 28832825221 in words is "twenty-eight billion, eight hundred thirty-two million, eight hundred twenty-five thousand, two hundred twenty-one".