28564689 has 8 divisors (see below), whose sum is σ = 39742272. Its totient is φ = 18215120.

The previous prime is 28564687. The next prime is 28564717. The reversal of 28564689 is 98646582.

It is a happy number.

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 28564689 - 2¹ = 28564687 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28564687) 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, 206922 + ... + 207059.

It is an arithmetic number, because the mean of its divisors is an integer number (4967784).

Almost surely, 2^28564689 is an apocalyptic number.

It is an amenable number.

28564689 is a deficient number, since it is larger than the sum of its proper divisors (11177583).

28564689 is a wasteful number, since it uses less digits than its factorization.

28564689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414007.

The product of its digits is 829440, while the sum is 48.

The square root of 28564689 is about 5344.5943718864. The cubic root of 28564689 is about 305.6866693191.

The spelling of 28564689 in words is "twenty-eight million, five hundred sixty-four thousand, six hundred eighty-nine".