28866009 has 8 divisors (see below), whose sum is σ = 39426912. Its totient is φ = 18774560.

The previous prime is 28865999. The next prime is 28866011. The reversal of 28866009 is 90066882.

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

It is a cyclic number.

It is not a de Polignac number, because 28866009 - 2¹⁹ = 28341721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28866109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117219 + ... + 117464.

It is an arithmetic number, because the mean of its divisors is an integer number (4928364).

Almost surely, 2^28866009 is an apocalyptic number.

It is an amenable number.

28866009 is a deficient number, since it is larger than the sum of its proper divisors (10560903).

28866009 is a wasteful number, since it uses less digits than its factorization.

28866009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234727.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 28866009 is about 5372.7096515632. The cubic root of 28866009 is about 306.7577763053.

The spelling of 28866009 in words is "twenty-eight million, eight hundred sixty-six thousand, nine".