28866199 has 4 divisors (see below), whose sum is σ = 28911736. Its totient is φ = 28820664.

The previous prime is 28866197. The next prime is 28866241. The reversal of 28866199 is 99166882.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28866199 - 2¹ = 28866197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21804 + ... + 23089.

It is an arithmetic number, because the mean of its divisors is an integer number (7227934).

Almost surely, 2^28866199 is an apocalyptic number.

28866199 is a deficient number, since it is larger than the sum of its proper divisors (45537).

28866199 is an equidigital number, since it uses as much as digits as its factorization.

28866199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45536.

The product of its digits is 373248, while the sum is 49.

The square root of 28866199 is about 5372.7273334872. The cubic root of 28866199 is about 306.7584493443.

The spelling of 28866199 in words is "twenty-eight million, eight hundred sixty-six thousand, one hundred ninety-nine".