28168689 has 8 divisors (see below), whose sum is σ = 37649152. Its totient is φ = 18733680.

The previous prime is 28168687. The next prime is 28168709. The reversal of 28168689 is 98686182.

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

It is not a de Polignac number, because 28168689 - 2¹ = 28168687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28168687) 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, 9889 + ... + 12414.

It is an arithmetic number, because the mean of its divisors is an integer number (4706144).

Almost surely, 2^28168689 is an apocalyptic number.

It is an amenable number.

28168689 is a deficient number, since it is larger than the sum of its proper divisors (9480463).

28168689 is a wasteful number, since it uses less digits than its factorization.

28168689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22727.

The product of its digits is 331776, while the sum is 48.

The square root of 28168689 is about 5307.4182989472. The cubic root of 28168689 is about 304.2674851714.

The spelling of 28168689 in words is "twenty-eight million, one hundred sixty-eight thousand, six hundred eighty-nine".