28243585 has 4 divisors (see below), whose sum is σ = 33892308. Its totient is φ = 22594864.

The previous prime is 28243583. The next prime is 28243597. The reversal of 28243585 is 58534282.

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 9199089 + 19044496 = 3033^2 + 4364^2 .

It is a cyclic number.

It is not a de Polignac number, because 28243585 - 2¹ = 28243583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28243583) 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, 2824354 + ... + 2824363.

It is an arithmetic number, because the mean of its divisors is an integer number (8473077).

Almost surely, 2^28243585 is an apocalyptic number.

It is an amenable number.

28243585 is a deficient number, since it is larger than the sum of its proper divisors (5648723).

28243585 is an equidigital number, since it uses as much as digits as its factorization.

28243585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648722.

The product of its digits is 76800, while the sum is 37.

The square root of 28243585 is about 5314.4693996673. The cubic root of 28243585 is about 304.5369125776.

The spelling of 28243585 in words is "twenty-eight million, two hundred forty-three thousand, five hundred eighty-five".