28384209 has 32 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 16109712.

The previous prime is 28384201. The next prime is 28384229. The reversal of 28384209 is 90248382.

28384209 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 28384209 - 2³ = 28384201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28384201) 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 31 ways as a sum of consecutive naturals, for example, 33412 + ... + 34250.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^28384209 is an apocalyptic number.

It is an amenable number.

28384209 is a deficient number, since it is larger than the sum of its proper divisors (19999791).

28384209 is a wasteful number, since it uses less digits than its factorization.

28384209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034 (or 1028 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28384209 is about 5327.6832676127. The cubic root of 28384209 is about 305.0415029073.

The spelling of 28384209 in words is "twenty-eight million, three hundred eighty-four thousand, two hundred nine".