Observable Universe Diameter

So, recently I have been doing lots of research on the diameter of the observable universe. It says on the wikipedia page that the diameter is 28.5 gigaparsecs, or gpc. One gigaparsec is 3.26 billion light-years. One light-year is 5.8 trillion miles. So multiply all of them together (28.5 * 3.26 * 5.8) and you get 538.878 billion trillion miles long!! Pretty cool, right? So, basically I was the only one who thought that it was either between 538-557 billion trillion miles long. But, this is awesome, I was checking out a space book and they thought it was 546!!!! Yay, finally someone who thinks nearest to me! See ya then 😀