87,531

Number
$9642$ (nine thousand, six hundred and forty-two) is:
 * $3 \times 163 \times 179$


 * With $9642$, forms the largest integer that can be obtained by multiplying $2$ integers which between them use all the digits from $1$ to $9$
 * $9642 \times 87531 = 843 \, 973 \, 902$

Also see

 * Largest Product of Pandigital Factors