Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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Given that

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Can you find out

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(Note: This is Logical, not Mathematical)

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What is the next number in this series?

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Crossword

The day before the 1996 U.S. presidential election, the NYT Crossword contained the clue “Lead story in tomorrow’s newspaper,” the puzzle was built so that both electoral outcomes were correct answers, requiring 7 other clues to have dual responses.