3,628,800

Number
$3 \, 628 \, 800$ (three million, six hundred and twenty-eight thousand, eight hundred ) is:


 * $2^8 \times 3^4 \times 5^2 \times 7$


 * The $10$th factorial after $1$, $2$, $6$, $24$, $120$, $720$, $5040$, $40 \, 320$, $362 \, 880$:
 * $3 \, 628 \, 800 = 10! = 10 \times 9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1$


 * Apart from the trivial $0!$, $1!$ and $2!$, the only factorial that is the product of $2$ consecutive factorials:
 * $10! = 6! \times 7!$