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CJam, 9 bytes
CJam has mQ, but unfortunately it trunctuates to an integer ... Another port of Lyxal's answer.
q~2 .5#/i
Explanation
q~ e# Take input & evaluate
2 e# Take 2 to the power of ...
.5# e# ... 0.5 (equal to square root)
/ e# Divide the input by it
i e# Convert to integer
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