28368009 has 16 divisors (see below), whose sum is σ = 42192640. Its totient is φ = 18837360.

The previous prime is 28367981. The next prime is 28368029. The reversal of 28368009 is 90086382.

It is not a de Polignac number, because 28368009 - 2⁸ = 28367753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28368029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5379 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (2637040).

Almost surely, 2^28368009 is an apocalyptic number.

It is an amenable number.

28368009 is a deficient number, since it is larger than the sum of its proper divisors (13824631).

28368009 is a wasteful number, since it uses less digits than its factorization.

28368009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157 (or 4151 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28368009 is about 5326.1626899673. The cubic root of 28368009 is about 304.9834587464.

The spelling of 28368009 in words is "twenty-eight million, three hundred sixty-eight thousand, nine".