28384709 has 2 divisors, whose sum is σ = 28384710. Its totient is φ = 28384708.

The previous prime is 28384693. The next prime is 28384711. The reversal of 28384709 is 90748382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15760900 + 12623809 = 3970^2 + 3553^2 .

It is a cyclic number.

It is not a de Polignac number, because 28384709 - 2⁴ = 28384693 is a prime.

Together with 28384711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28384789) 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 as a sum of consecutive naturals, namely, 14192354 + 14192355.

It is an arithmetic number, because the mean of its divisors is an integer number (14192355).

Almost surely, 2^28384709 is an apocalyptic number.

It is an amenable number.

28384709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28384709 is an equidigital number, since it uses as much as digits as its factorization.

28384709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28384709 is about 5327.7301921175. The cubic root of 28384709 is about 305.0432940423.

The spelling of 28384709 in words is "twenty-eight million, three hundred eighty-four thousand, seven hundred nine".