Question:
The sum of the product and the sum of two positive integers is $454$. Find the largest possible value of the product of their sum and their product.

Answer:
With word problems, the first step is to translate the words into equations. Let the two numbers be $a$ and $b$. Then their sum is $a+b$ and their product is $ab$. The sum of their product and their sum is $a+b+ab$. So we know  \begin{align*}
ab+a+b&=454\quad\Rightarrow\\
a(b+1)+(b+1)&=454+1\quad\Rightarrow\\
(a+1)(b+1)&=455.
\end{align*}The prime factorization of $455$ is $5\cdot 7\cdot 13$. Since the equation is symmetric with $a$ and $b$, we may (without loss of generality) suppose that $a<b$. Thus $a+1<b+1$, so in each factor pair the smaller factor is equal to $a+1$. We list all possibilities: \begin{tabular}{c|c|c|c}
$a+1$&$b+1$&$a$&$b$\\ \hline
$1$&$455$&$0$&$454$\\
$5$&$91$&$4$&$90$\\
$7$&$65$&$6$&$64$\\
$13$&$35$&$12$&$34$
\end{tabular}We must find the largest possible value of "the product of their sum and their product", or $ab\cdot(a+b)$. We know the first possibility above gives a value of zero, while all the others will be greater than zero. We check: \begin{align*}
4\cdot 90\cdot (4+90)&=4\cdot 90\cdot 94=33840\\
6\cdot 64\cdot (6+64)&=6\cdot 64\cdot 70=26880\\
12\cdot 34\cdot (12+34)&=12\cdot 34\cdot 46=18768.
\end{align*}Thus the largest possible desired value is $\boxed{33840}$, achieved when $(a,b)=(4,90)$.