28285563 has 8 divisors (see below), whose sum is σ = 37754176. Its totient is φ = 18837000.

The previous prime is 28285541. The next prime is 28285571. The reversal of 28285563 is 36558282.

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

It is not a de Polignac number, because 28285563 - 2⁸ = 28285307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28285513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1333 + ... + 7638.

It is an arithmetic number, because the mean of its divisors is an integer number (4719272).

Almost surely, 2^28285563 is an apocalyptic number.

28285563 is a deficient number, since it is larger than the sum of its proper divisors (9468613).

28285563 is a wasteful number, since it uses less digits than its factorization.

28285563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10025.

The product of its digits is 115200, while the sum is 39.

The square root of 28285563 is about 5318.4173397732. The cubic root of 28285563 is about 304.6877140459.

The spelling of 28285563 in words is "twenty-eight million, two hundred eighty-five thousand, five hundred sixty-three".