28243269 has 8 divisors (see below), whose sum is σ = 41841920. Its totient is φ = 18828828.

The previous prime is 28243261. The next prime is 28243283. The reversal of 28243269 is 96234282.

It is not a de Polignac number, because 28243269 - 2³ = 28243261 is a prime.

It is a super-2 number, since 2×28243269² = 1595364487612722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522997 + ... + 523050.

It is an arithmetic number, because the mean of its divisors is an integer number (5230240).

Almost surely, 2^28243269 is an apocalyptic number.

It is an amenable number.

28243269 is a deficient number, since it is larger than the sum of its proper divisors (13598651).

28243269 is a wasteful number, since it uses less digits than its factorization.

28243269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046056 (or 1046050 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 28243269 is about 5314.4396694289. The cubic root of 28243269 is about 304.5357768150.

The spelling of 28243269 in words is "twenty-eight million, two hundred forty-three thousand, two hundred sixty-nine".