mn4.mml

<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mn>100</mn> 
    <mo>!</mo> 
  </mrow> 
  <mo>=</mo> 
  <mn>93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000</mn> </math>