28204223 has 2 divisors, whose sum is σ = 28204224. Its totient is φ = 28204222.

The previous prime is 28204219. The next prime is 28204229. The reversal of 28204223 is 32240282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28204223 - 2² = 28204219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28204229) 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 as a sum of consecutive naturals, namely, 14102111 + 14102112.

It is an arithmetic number, because the mean of its divisors is an integer number (14102112).

Almost surely, 2^28204223 is an apocalyptic number.

28204223 is a deficient number, since it is larger than the sum of its proper divisors (1).

28204223 is an equidigital number, since it uses as much as digits as its factorization.

28204223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 28204223 is about 5310.7648225091. The cubic root of 28204223 is about 304.3953730037.

The spelling of 28204223 in words is "twenty-eight million, two hundred four thousand, two hundred twenty-three".