28085199 has 4 divisors (see below), whose sum is σ = 37446936. Its totient is φ = 18723464.

The previous prime is 28085191. The next prime is 28085237. The reversal of 28085199 is 99158082.

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 28085199 - 2³ = 28085191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28085199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085191) 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, 4680864 + ... + 4680869.

It is an arithmetic number, because the mean of its divisors is an integer number (9361734).

Almost surely, 2^28085199 is an apocalyptic number.

28085199 is a deficient number, since it is larger than the sum of its proper divisors (9361737).

28085199 is an equidigital number, since it uses as much as digits as its factorization.

28085199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9361736.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 28085199 is about 5299.5470561172. The cubic root of 28085199 is about 303.9665785915.

The spelling of 28085199 in words is "twenty-eight million, eighty-five thousand, one hundred ninety-nine".