28671909 has 12 divisors (see below), whose sum is σ = 44470944. Its totient is φ = 16383864.

The previous prime is 28671899. The next prime is 28671917. The reversal of 28671909 is 90917682.

It is not a de Polignac number, because 28671909 - 2⁸ = 28671653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671919) 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 11 ways as a sum of consecutive naturals, for example, 97377 + ... + 97670.

It is an arithmetic number, because the mean of its divisors is an integer number (3705912).

Almost surely, 2^28671909 is an apocalyptic number.

It is an amenable number.

28671909 is a deficient number, since it is larger than the sum of its proper divisors (15799035).

28671909 is a wasteful number, since it uses less digits than its factorization.

28671909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195064 (or 195057 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 28671909 is about 5354.6156724829. The cubic root of 28671909 is about 306.0686654398.

The spelling of 28671909 in words is "twenty-eight million, six hundred seventy-one thousand, nine hundred nine".