28276369 has 6 divisors (see below), whose sum is σ = 31080770. Its totient is φ = 25705680.

The previous prime is 28276349. The next prime is 28276387. The reversal of 28276369 is 96367282.

It can be written as a sum of positive squares in only one way, i.e., 28227969 + 48400 = 5313^2 + 220^2 .

It is not a de Polignac number, because 28276369 - 2¹⁵ = 28243601 is a prime.

It is a super-2 number, since 2×28276369² = 1599106087648322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28276319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116724 + ... + 116965.

Almost surely, 2^28276369 is an apocalyptic number.

It is an amenable number.

28276369 is a deficient number, since it is larger than the sum of its proper divisors (2804401).

28276369 is a wasteful number, since it uses less digits than its factorization.

28276369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233711 (or 233700 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 28276369 is about 5317.5529146403. The cubic root of 28276369 is about 304.6546983527.

The spelling of 28276369 in words is "twenty-eight million, two hundred seventy-six thousand, three hundred sixty-nine".