28288133 has 4 divisors (see below), whose sum is σ = 28299168. Its totient is φ = 28277100.

The previous prime is 28288121. The next prime is 28288147. The reversal of 28288133 is 33188282.

It is a happy number.

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 28288133 - 2⁸ = 28287877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28288093 and 28288102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560 + ... + 7542.

It is an arithmetic number, because the mean of its divisors is an integer number (7074792).

Almost surely, 2^28288133 is an apocalyptic number.

It is an amenable number.

28288133 is a deficient number, since it is larger than the sum of its proper divisors (11035).

28288133 is an equidigital number, since it uses as much as digits as its factorization.

28288133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11034.

The product of its digits is 18432, while the sum is 35.

The square root of 28288133 is about 5318.6589475168. The cubic root of 28288133 is about 304.6969416474.

The spelling of 28288133 in words is "twenty-eight million, two hundred eighty-eight thousand, one hundred thirty-three".