28017609 has 8 divisors (see below), whose sum is σ = 39323040. Its totient is φ = 17695296.

The previous prime is 28017601. The next prime is 28017631. The reversal of 28017609 is 90671082.

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

It is not a de Polignac number, because 28017609 - 2³ = 28017601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28017609.

It is not an unprimeable number, because it can be changed into a prime (28017601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245712 + ... + 245825.

It is an arithmetic number, because the mean of its divisors is an integer number (4915380).

Almost surely, 2^28017609 is an apocalyptic number.

It is an amenable number.

28017609 is a deficient number, since it is larger than the sum of its proper divisors (11305431).

28017609 is a wasteful number, since it uses less digits than its factorization.

28017609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491559.

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

The square root of 28017609 is about 5293.1662547099. The cubic root of 28017609 is about 303.7225401517.

The spelling of 28017609 in words is "twenty-eight million, seventeen thousand, six hundred nine".