28268865 has 64 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 14012352.

The previous prime is 28268843. The next prime is 28268879. The reversal of 28268865 is 56886282.

It is not a de Polignac number, because 28268865 - 2⁵ = 28268833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28268865.

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 63 ways as a sum of consecutive naturals, for example, 264142 + ... + 264248.

It is an arithmetic number, because the mean of its divisors is an integer number (842400).

Almost surely, 2^28268865 is an apocalyptic number.

It is an amenable number.

28268865 is a deficient number, since it is larger than the sum of its proper divisors (25644735).

28268865 is a wasteful number, since it uses less digits than its factorization.

28268865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 28268865 is about 5316.8472801088. The cubic root of 28268865 is about 304.6277461520.

The spelling of 28268865 in words is "twenty-eight million, two hundred sixty-eight thousand, eight hundred sixty-five".