28090865 has 16 divisors (see below), whose sum is σ = 36944640. Its totient is φ = 20334720.

The previous prime is 28090859. The next prime is 28090877. The reversal of 28090865 is 56809082.

It is not a de Polignac number, because 28090865 - 2⁸ = 28090609 is a prime.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 12077 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (2309040).

Almost surely, 2^28090865 is an apocalyptic number.

It is an amenable number.

28090865 is a deficient number, since it is larger than the sum of its proper divisors (8853775).

28090865 is a wasteful number, since it uses less digits than its factorization.

28090865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 28090865 is about 5300.0816031454. The cubic root of 28090865 is about 303.9870182880.

The spelling of 28090865 in words is "twenty-eight million, ninety thousand, eight hundred sixty-five".