28833309 has 24 divisors (see below), whose sum is σ = 44366400. Its totient is φ = 17981568.

The previous prime is 28833307. The next prime is 28833331. The reversal of 28833309 is 90333882.

It is not a de Polignac number, because 28833309 - 2¹ = 28833307 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28833307) 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 23 ways as a sum of consecutive naturals, for example, 29974 + ... + 30920.

It is an arithmetic number, because the mean of its divisors is an integer number (1848600).

Almost surely, 2^28833309 is an apocalyptic number.

It is an amenable number.

28833309 is a deficient number, since it is larger than the sum of its proper divisors (15533091).

28833309 is a wasteful number, since it uses less digits than its factorization.

28833309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 28833309 is about 5369.6656320482. The cubic root of 28833309 is about 306.6418987296.

The spelling of 28833309 in words is "twenty-eight million, eight hundred thirty-three thousand, three hundred nine".