28218269 has 2 divisors, whose sum is σ = 28218270. Its totient is φ = 28218268.

The previous prime is 28218259. The next prime is 28218293. The reversal of 28218269 is 96281282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27426169 + 792100 = 5237^2 + 890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28218269 is a prime.

It is a super-2 number, since 2×28218269² = 1592541410712722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28218259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109134 + 14109135.

It is an arithmetic number, because the mean of its divisors is an integer number (14109135).

Almost surely, 2^28218269 is an apocalyptic number.

It is an amenable number.

28218269 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218269 is an equidigital number, since it uses as much as digits as its factorization.

28218269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 28218269 is about 5312.0870663045. The cubic root of 28218269 is about 304.4458953179.

The spelling of 28218269 in words is "twenty-eight million, two hundred eighteen thousand, two hundred sixty-nine".