28099223 has 4 divisors (see below), whose sum is σ = 28559928. Its totient is φ = 27638520.

The previous prime is 28099217. The next prime is 28099297. The reversal of 28099223 is 32299082.

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 28099223 - 2²⁴ = 11322007 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 (28099213) by changing a digit.

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, 230261 + ... + 230382.

It is an arithmetic number, because the mean of its divisors is an integer number (7139982).

Almost surely, 2^28099223 is an apocalyptic number.

28099223 is a deficient number, since it is larger than the sum of its proper divisors (460705).

28099223 is an equidigital number, since it uses as much as digits as its factorization.

28099223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460704.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28099223 is about 5300.8700229302. The cubic root of 28099223 is about 304.0171641682.

The spelling of 28099223 in words is "twenty-eight million, ninety-nine thousand, two hundred twenty-three".