28286009 has 4 divisors (see below), whose sum is σ = 28303440. Its totient is φ = 28268580.

The previous prime is 28285997. The next prime is 28286017. The reversal of 28286009 is 90068282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28286009 - 2⁸ = 28285753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28286009.

It is not an unprimeable number, because it can be changed into a prime (28286039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5999 + ... + 9620.

It is an arithmetic number, because the mean of its divisors is an integer number (7075860).

Almost surely, 2^28286009 is an apocalyptic number.

It is an amenable number.

28286009 is a deficient number, since it is larger than the sum of its proper divisors (17431).

28286009 is a wasteful number, since it uses less digits than its factorization.

28286009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17430.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28286009 is about 5318.4592693749. The cubic root of 28286009 is about 304.6893154518.

The spelling of 28286009 in words is "twenty-eight million, two hundred eighty-six thousand, nine".