28985865 has 16 divisors (see below), whose sum is σ = 48394368. Its totient is φ = 14786816.

The previous prime is 28985863. The next prime is 28985903. The reversal of 28985865 is 56858982.

It is a cyclic number.

It is not a de Polignac number, because 28985865 - 2¹ = 28985863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28985861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41664 + ... + 42353.

It is an arithmetic number, because the mean of its divisors is an integer number (3024648).

Almost surely, 2^28985865 is an apocalyptic number.

It is an amenable number.

28985865 is a deficient number, since it is larger than the sum of its proper divisors (19408503).

28985865 is a wasteful number, since it uses less digits than its factorization.

28985865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84048.

The product of its digits is 1382400, while the sum is 51.

The square root of 28985865 is about 5383.8522453723. The cubic root of 28985865 is about 307.1817581365.

The spelling of 28985865 in words is "twenty-eight million, nine hundred eighty-five thousand, eight hundred sixty-five".