28347223 has 4 divisors (see below), whose sum is σ = 28471240. Its totient is φ = 28223208.

The previous prime is 28347197. The next prime is 28347229. The reversal of 28347223 is 32274382.

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 28347223 - 2⁹ = 28346711 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 (28347229) 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, 61665 + ... + 62122.

It is an arithmetic number, because the mean of its divisors is an integer number (7117810).

Almost surely, 2^28347223 is an apocalyptic number.

28347223 is a deficient number, since it is larger than the sum of its proper divisors (124017).

28347223 is a wasteful number, since it uses less digits than its factorization.

28347223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124016.

The product of its digits is 16128, while the sum is 31.

The square root of 28347223 is about 5324.2110213627. The cubic root of 28347223 is about 304.9089506958.

The spelling of 28347223 in words is "twenty-eight million, three hundred forty-seven thousand, two hundred twenty-three".