What is FACTDOUBLE function in Excel? FACTDOUBLE function is one of the Math and Trig functions in Microsoft Excel that returns the double factorial of a number. Syntax of FACTDOUBLE function FACTDOUBLE(number) The FACTDOUBLE function syntax has the following arguments: Number: The value for which to return the double factorial. If number is not an integer, it is truncated. FACTDOUBLE formula…