logarithm

Here's a start:

Take 10 to the power of the decimal part of 7.6443636

100.6443636=4.409238\displaystyle 10^{0.6443636}=4.409238
 
Also

(32400)17  =  4.409238\displaystyle (32400)^{\frac{1}{7}} \ \ = \ \ 4.409238
 
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