28605865 has 8 divisors (see below), whose sum is σ = 34382088. Its totient is φ = 22848000.

The previous prime is 28605833. The next prime is 28605911. The reversal of 28605865 is 56850682.

It can be written as a sum of positive squares in 4 ways, for example, as 4761 + 28601104 = 69^2 + 5348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28605865 - 2⁵ = 28605833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (4297761).

Almost surely, 2^28605865 is an apocalyptic number.

It is an amenable number.

28605865 is a deficient number, since it is larger than the sum of its proper divisors (5776223).

28605865 is an equidigital number, since it uses as much as digits as its factorization.

28605865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9179.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 28605865 is about 5348.4451011486. The cubic root of 28605865 is about 305.8334812460.

The spelling of 28605865 in words is "twenty-eight million, six hundred five thousand, eight hundred sixty-five".