28668199 has 8 divisors (see below), whose sum is σ = 33065120. Its totient is φ = 24346656.

The previous prime is 28668193. The next prime is 28668217. The reversal of 28668199 is 99186682.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28668199 - 2¹⁹ = 28143911 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 (28668193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18024 + ... + 19549.

It is an arithmetic number, because the mean of its divisors is an integer number (4133140).

Almost surely, 2^28668199 is an apocalyptic number.

28668199 is a deficient number, since it is larger than the sum of its proper divisors (4396921).

28668199 is a wasteful number, since it uses less digits than its factorization.

28668199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37689.

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

The square root of 28668199 is about 5354.2692311837. The cubic root of 28668199 is about 306.0554636246.

The spelling of 28668199 in words is "twenty-eight million, six hundred sixty-eight thousand, one hundred ninety-nine".