28333809 has 36 divisors (see below), whose sum is σ = 48657024. Its totient is φ = 15834672.

The previous prime is 28333763. The next prime is 28333817. The reversal of 28333809 is 90833382.

It is not a de Polignac number, because 28333809 - 2⁸ = 28333553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28333889) 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 35 ways as a sum of consecutive naturals, for example, 20044 + ... + 21410.

It is an arithmetic number, because the mean of its divisors is an integer number (1351584).

Almost surely, 2^28333809 is an apocalyptic number.

It is an amenable number.

28333809 is a deficient number, since it is larger than the sum of its proper divisors (20323215).

28333809 is a wasteful number, since it uses less digits than its factorization.

28333809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434 (or 1424 counting only the distinct ones).

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

The square root of 28333809 is about 5322.9511551394. The cubic root of 28333809 is about 304.8608484652.

The spelling of 28333809 in words is "twenty-eight million, three hundred thirty-three thousand, eight hundred nine".