28334021 has 2 divisors, whose sum is σ = 28334022. Its totient is φ = 28334020.

The previous prime is 28334017. The next prime is 28334027. The reversal of 28334021 is 12043382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 8850625 = 4414^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 28334021 - 2² = 28334017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28334027) 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 as a sum of consecutive naturals, namely, 14167010 + 14167011.

It is an arithmetic number, because the mean of its divisors is an integer number (14167011).

Almost surely, 2^28334021 is an apocalyptic number.

It is an amenable number.

28334021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28334021 is an equidigital number, since it uses as much as digits as its factorization.

28334021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28334021 is about 5322.9710688675. The cubic root of 28334021 is about 304.8616088093.

The spelling of 28334021 in words is "twenty-eight million, three hundred thirty-four thousand, twenty-one".