The FACTORIAL function returns an integer that is the factorial of argument-1. The type of this function is integer. 
                  
 
            
            
               General Format
 
               	  
               	  
 
               
              
            
            
               Arguments
 
               	  
                
                  	 
                  - Argument-1 must be an integer greater than or equal to zero. 
                     	 
                  
  
            
            
               Returned Values
 
               	  
                
                  	 
                  - If the value of argument-1 is zero, the value 1 is returned. 
                     	 
                  
- If the value of argument-1 is positive, its factorial is returned. 
                     	 
                  
- Floating-point format is used for numeric non-integer results.