How can I get rid of the number in the red badge on the icon?

The red badge can be set to show the current day or the week number or other calendar information.

To remove it, please do the following:

  1. tap on the little gear icon in the bottom bar (1st icon next to the today button)
  2. tap on "Settings"
  3. go into the "General" entry
  4. go into the "Badge" entry
  5. set "Badge" to "None"