28117223 has 4 divisors (see below), whose sum is σ = 28133448. Its totient is φ = 28101000.

The previous prime is 28117213. The next prime is 28117231. The reversal of 28117223 is 32271182.

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 28117223 - 2²⁰ = 27068647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28117192 and 28117201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117213) 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, 5153 + ... + 9098.

It is an arithmetic number, because the mean of its divisors is an integer number (7033362).

Almost surely, 2^28117223 is an apocalyptic number.

28117223 is a deficient number, since it is larger than the sum of its proper divisors (16225).

28117223 is a wasteful number, since it uses less digits than its factorization.

28117223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16224.

The product of its digits is 1344, while the sum is 26.

The square root of 28117223 is about 5302.5675856136. The cubic root of 28117223 is about 304.0820668036.

The spelling of 28117223 in words is "twenty-eight million, one hundred seventeen thousand, two hundred twenty-three".