Break 61728 into place values and write each part in words.
• 61 728 = 61 thousands + 728
• 61 thousand = sixty-one thousand
• 728 = seven hundred and twenty-eight
• Together: sixty-one thousand, seven hundred and twenty-eight
Eliminate distractors:
• "Six hundred and seventeen thousand..." would be 617 000 — too large
• "Sixty-one hundred..." would be 6 100 — too small
• "Six hundred and ten thousand..." would be 610 000 — too large
Final Answer: D: Sixty-one thousand, seven hundred and twenty-eight