Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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Rules to be followed:
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Mother: the mother cannot stay in the raft or outside the rat without the presence of the father.
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The rules are applicable not only in the raft but also outside the raft.

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Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

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He collects a total of 324 coins.

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.