title: Remove nth digit from an integer without converting to string
body: <p>Say I have this integer in java, <code>987654321</code>. I want to be able to remove, say the third and fourth digits, so I can get <code>9876521</code> in java.</p>
  
  <p>I know I can do this by converting to a string, then taking a substring, but is there a way to do this without converting to a string?</p>