28866865 has 4 divisors (see below), whose sum is σ = 34640244. Its totient is φ = 23093488.

The previous prime is 28866853. The next prime is 28866881. The reversal of 28866865 is 56866882.

It is a happy number.

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 14961424 + 13905441 = 3868^2 + 3729^2 .

It is a cyclic number.

It is not a de Polignac number, because 28866865 - 2⁷ = 28866737 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, 2886682 + ... + 2886691.

It is an arithmetic number, because the mean of its divisors is an integer number (8660061).

Almost surely, 2^28866865 is an apocalyptic number.

It is an amenable number.

28866865 is a deficient number, since it is larger than the sum of its proper divisors (5773379).

28866865 is an equidigital number, since it uses as much as digits as its factorization.

28866865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773378.

The product of its digits is 1105920, while the sum is 49.

The square root of 28866865 is about 5372.7893128244. The cubic root of 28866865 is about 306.7608084998.

The spelling of 28866865 in words is "twenty-eight million, eight hundred sixty-six thousand, eight hundred sixty-five".