28. A three-digit number with all distinct digits, when 2022 is written in front of it, becomes a seven-digit number, which is an integer multiple of the original three-digit number. What is the smallest original three-digit number? $\qquad$
\begin{tabular}{|c|}
\hline $\mathbf{28}$ \\
\hline 120 \\
\hline
\end{tabular}