28716009 has 24 divisors (see below), whose sum is σ = 47163168. Its totient is φ = 15442560.

The previous prime is 28716001. The next prime is 28716041. The reversal of 28716009 is 90061782.

It is not a de Polignac number, because 28716009 - 2³ = 28716001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28716001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3247 + ... + 8244.

It is an arithmetic number, because the mean of its divisors is an integer number (1965132).

Almost surely, 2^28716009 is an apocalyptic number.

It is an amenable number.

28716009 is a deficient number, since it is larger than the sum of its proper divisors (18447159).

28716009 is a wasteful number, since it uses less digits than its factorization.

28716009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11525 (or 11518 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 28716009 is about 5358.7320328600. The cubic root of 28716009 is about 306.2255055239.

The spelling of 28716009 in words is "twenty-eight million, seven hundred sixteen thousand, nine".