28716865 has 4 divisors (see below), whose sum is σ = 34460244. Its totient is φ = 22973488.

The previous prime is 28716841. The next prime is 28716899. The reversal of 28716865 is 56861782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 14930496 = 3713^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 28716865 - 2⁵ = 28716833 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 2871682 + ... + 2871691.

It is an arithmetic number, because the mean of its divisors is an integer number (8615061).

Almost surely, 2^28716865 is an apocalyptic number.

It is an amenable number.

28716865 is a deficient number, since it is larger than the sum of its proper divisors (5743379).

28716865 is an equidigital number, since it uses as much as digits as its factorization.

28716865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5743378.

The product of its digits is 161280, while the sum is 43.

The square root of 28716865 is about 5358.8119019051. The cubic root of 28716865 is about 306.2285482683.

The spelling of 28716865 in words is "twenty-eight million, seven hundred sixteen thousand, eight hundred sixty-five".