Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

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There are six people in a family namely M, N, O, P, Q and R.

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Only one color, but not one size,
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Present in sun, but not in rain,
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Amazing Facts

No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki