28269291 has 16 divisors (see below), whose sum is σ = 38568960. Its totient is φ = 18412320.

The previous prime is 28269257. The next prime is 28269313. The reversal of 28269291 is 19296282.

It is not a de Polignac number, because 28269291 - 2¹⁰ = 28268267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28269211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32326 + ... + 33188.

It is an arithmetic number, because the mean of its divisors is an integer number (2410560).

Almost surely, 2^28269291 is an apocalyptic number.

28269291 is a deficient number, since it is larger than the sum of its proper divisors (10299669).

28269291 is a wasteful number, since it uses less digits than its factorization.

28269291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its digits is 31104, while the sum is 39.

The square root of 28269291 is about 5316.8873412928. The cubic root of 28269291 is about 304.6292763486.

The spelling of 28269291 in words is "twenty-eight million, two hundred sixty-nine thousand, two hundred ninety-one".