Simplify expression displayed in command window

How can r be simplified? r is used further down the program as a number. I just want r to be displayed as a number in the command window. What operator do I have to add in front of r to display it in number form?

r =

1/332306998946228968225951765070086144*35635536596067290180312771580437^(1/2)*332306998946228968225951765070086144^(1/2)

Answer 1

[Sean de Wolski]

vpa(r,10)  %change 10 to desired number of digits

or

double(r)