The multiplicative digital root of a positive integer n is found by multiplying the digits of n together, then repeating this operation until only a single digit remains. This single-digit number is called the multiplicative digital root of n.
Multiplicative digital roots depend upon the base in which n is written. If the term is used without qualification, it is assumed that n is written in base 10.
Multiplicative digital roots are the multiplicative equivalent of digital roots.
Read more about Multiplicative Digital Root: Example
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