28043269 has 4 divisors (see below), whose sum is σ = 28055680. Its totient is φ = 28030860.

The previous prime is 28043263. The next prime is 28043273. The reversal of 28043269 is 96234082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28043269 - 2²¹ = 25946117 is a prime.

It is a super-2 number, since 2×28043269² = 1572849872412722, 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 (28043263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749 + ... + 7690.

It is an arithmetic number, because the mean of its divisors is an integer number (7013920).

Almost surely, 2^28043269 is an apocalyptic number.

It is an amenable number.

28043269 is a deficient number, since it is larger than the sum of its proper divisors (12411).

28043269 is an equidigital number, since it uses as much as digits as its factorization.

28043269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12410.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28043269 is about 5295.5895800185. The cubic root of 28043269 is about 303.8152335522.

The spelling of 28043269 in words is "twenty-eight million, forty-three thousand, two hundred sixty-nine".