Break the digits into groups: 9,504,672.<br><br>
&bull; Millions: 9 → nine million<br>
&bull; Thousands: 504 → five hundred and four thousand<br>
&bull; Ones: 672 → six hundred and seventy-two<br><br>
Write in words: nine million, five hundred and four thousand, six hundred and seventy-two.<br><br>
Final Answer: Option 0: nine million, five hundred and four thousand, six hundred and seventy-two