28699865 has 4 divisors (see below), whose sum is σ = 34439844. Its totient is φ = 22959888.

The previous prime is 28699843. The next prime is 28699889. The reversal of 28699865 is 56899682.

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 20313049 + 8386816 = 4507^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 28699865 - 2¹⁰ = 28698841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2869982 + ... + 2869991.

It is an arithmetic number, because the mean of its divisors is an integer number (8609961).

Almost surely, 2^28699865 is an apocalyptic number.

It is an amenable number.

28699865 is a deficient number, since it is larger than the sum of its proper divisors (5739979).

28699865 is an equidigital number, since it uses as much as digits as its factorization.

28699865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5739978.

The product of its digits is 1866240, while the sum is 53.

The square root of 28699865 is about 5357.2254946007. The cubic root of 28699865 is about 306.1681086053.

The spelling of 28699865 in words is "twenty-eight million, six hundred ninety-nine thousand, eight hundred sixty-five".