Challenge: Generate a 64 in the display (RPN)

[Gene]

Maybe we need two separate categories :-)

Those using common functions across most machines (+ - SIN COS LN X<>Y) etc. and those using functions only found on one machine? :-)

I am looking forward to the seemingly wide variety of responses. None of them will be out of bounds but likely to generate "Why didn't I think of that?"

feel free to start posting actual solutions at noon central time USA (that's 5 hours from this post).