Factorial Mania!

If the base 1010 representation of 40!40! is:

abcdef283247897734345611269596115894272000000000\overline{abcdef283247897734345611269596115894272000000000},

find the value of a+b+c+d+e+fa+b+c+d+e+f

Solve this without WolframAlpha.

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