28328243885 has 8 divisors (see below), whose sum is σ = 33994811256. Its totient is φ = 22661982720.

The previous prime is 28328243849. The next prime is 28328243891. The reversal of 28328243885 is 58834282382.

It can be written as a sum of positive squares in 4 ways, for example, as 1721088196 + 26607155689 = 41486^2 + 163117^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28328243885 - 2⁶ = 28328243821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267845 + ... + 358325.

It is an arithmetic number, because the mean of its divisors is an integer number (4249351407).

Almost surely, 2^28328243885 is an apocalyptic number.

It is an amenable number.

28328243885 is a deficient number, since it is larger than the sum of its proper divisors (5666567371).

28328243885 is an equidigital number, since it uses as much as digits as its factorization.

28328243885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153103.

The product of its digits is 5898240, while the sum is 53.

The spelling of 28328243885 in words is "twenty-eight billion, three hundred twenty-eight million, two hundred forty-three thousand, eight hundred eighty-five".