28268213 has 2 divisors, whose sum is σ = 28268214. Its totient is φ = 28268212.

The previous prime is 28268189. The next prime is 28268221. The reversal of 28268213 is 31286282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27952369 + 315844 = 5287^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 28268213 - 2¹⁰ = 28267189 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28268213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28268293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14134106 + 14134107.

It is an arithmetic number, because the mean of its divisors is an integer number (14134107).

Almost surely, 2^28268213 is an apocalyptic number.

It is an amenable number.

28268213 is a deficient number, since it is larger than the sum of its proper divisors (1).

28268213 is an equidigital number, since it uses as much as digits as its factorization.

28268213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 28268213 is about 5316.7859652237. The cubic root of 28268213 is about 304.6254041311.

The spelling of 28268213 in words is "twenty-eight million, two hundred sixty-eight thousand, two hundred thirteen".