28384689 has 8 divisors (see below), whose sum is σ = 39838240. Its totient is φ = 17927136.

The previous prime is 28384673. The next prime is 28384693. The reversal of 28384689 is 98648382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28384689 - 2⁴ = 28384673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28384289) 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 7 ways as a sum of consecutive naturals, for example, 248932 + ... + 249045.

It is an arithmetic number, because the mean of its divisors is an integer number (4979780).

Almost surely, 2^28384689 is an apocalyptic number.

It is an amenable number.

28384689 is a deficient number, since it is larger than the sum of its proper divisors (11453551).

28384689 is a wasteful number, since it uses less digits than its factorization.

28384689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497999.

The product of its digits is 663552, while the sum is 48.

The square root of 28384689 is about 5327.7283151452. The cubic root of 28384689 is about 305.0432223973.

The spelling of 28384689 in words is "twenty-eight million, three hundred eighty-four thousand, six hundred eighty-nine".