28342885 has 4 divisors (see below), whose sum is σ = 34011468. Its totient is φ = 22674304.

The previous prime is 28342871. The next prime is 28342901. The reversal of 28342885 is 58824382.

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 18714276 + 9628609 = 4326^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 28342885 - 2⁹ = 28342373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834284 + ... + 2834293.

It is an arithmetic number, because the mean of its divisors is an integer number (8502867).

Almost surely, 2^28342885 is an apocalyptic number.

It is an amenable number.

28342885 is a deficient number, since it is larger than the sum of its proper divisors (5668583).

28342885 is an equidigital number, since it uses as much as digits as its factorization.

28342885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668582.

The product of its digits is 122880, while the sum is 40.

The square root of 28342885 is about 5323.8036214722. The cubic root of 28342885 is about 304.8933964090.

The spelling of 28342885 in words is "twenty-eight million, three hundred forty-two thousand, eight hundred eighty-five".