28319865 has 16 divisors (see below), whose sum is σ = 51785088. Its totient is φ = 12946176.

The previous prime is 28319821. The next prime is 28319867. The reversal of 28319865 is 56891382.

It is not a de Polignac number, because 28319865 - 2⁸ = 28319609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28319867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134752 + ... + 134961.

It is an arithmetic number, because the mean of its divisors is an integer number (3236568).

Almost surely, 2^28319865 is an apocalyptic number.

It is an amenable number.

28319865 is a deficient number, since it is larger than the sum of its proper divisors (23465223).

28319865 is a wasteful number, since it uses less digits than its factorization.

28319865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269728.

The product of its digits is 103680, while the sum is 42.

The square root of 28319865 is about 5321.6411942182. The cubic root of 28319865 is about 304.8108295730.

The spelling of 28319865 in words is "twenty-eight million, three hundred nineteen thousand, eight hundred sixty-five".