Number of Trailing Zeros !

$\\*\emph{\text{What is the maximum value of positive integer }} n \emph{\text{ such that }} 4798!!\emph{\text{ is exactly divisible by }}10^n\ ?\\*(\emph{\text{In other words, how many trailing zeros are there in }}4798!!\ ?)\\*\\*^+\[n!!\emph{\text{ denotes the double factorial or semi-factorial of a number n, defined as:}}\\*n!!=n(n-2)(n-4)...(n-2.\lceil n/2\rceil+2 )=\prod_{k=0}^{\lceil \frac{n}{2} \rceil-1}(n-2k)\\*\emph{\text{It should not be confused with the factorial function iterated twice i.e. }} n!! \neq(n!)!]$