28827585 has 12 divisors (see below), whose sum is σ = 49967892. Its totient is φ = 15374688.

The previous prime is 28827583. The next prime is 28827599. The reversal of 28827585 is 58572882.

It can be written as a sum of positive squares in 2 ways, for example, as 14265729 + 14561856 = 3777^2 + 3816^2 .

It is not a de Polignac number, because 28827585 - 2¹ = 28827583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 640613 = 28827585 / (2 + 8 + 8 + 2 + 7 + 5 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28827585.

It is not an unprimeable number, because it can be changed into a prime (28827581) 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 11 ways as a sum of consecutive naturals, for example, 320262 + ... + 320351.

It is an arithmetic number, because the mean of its divisors is an integer number (4163991).

Almost surely, 2^28827585 is an apocalyptic number.

It is an amenable number.

28827585 is a deficient number, since it is larger than the sum of its proper divisors (21140307).

28827585 is a wasteful number, since it uses less digits than its factorization.

28827585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640624 (or 640621 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 28827585 is about 5369.1326115118. The cubic root of 28827585 is about 306.6216058293.

The spelling of 28827585 in words is "twenty-eight million, eight hundred twenty-seven thousand, five hundred eighty-five".