28084223 has 12 divisors (see below), whose sum is σ = 30301560. Its totient is φ = 25947792.

The previous prime is 28084207. The next prime is 28084237. The reversal of 28084223 is 32248082.

It is not a de Polignac number, because 28084223 - 2⁴ = 28084207 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 (28084253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168086 + ... + 168252.

It is an arithmetic number, because the mean of its divisors is an integer number (2525130).

Almost surely, 2^28084223 is an apocalyptic number.

28084223 is a deficient number, since it is larger than the sum of its proper divisors (2217337).

28084223 is an equidigital number, since it uses as much as digits as its factorization.

28084223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28084223 is about 5299.4549719759. The cubic root of 28084223 is about 303.9630574626.

The spelling of 28084223 in words is "twenty-eight million, eighty-four thousand, two hundred twenty-three".