The fourth perfect number is 8128.
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The fourth positive cube number is 4x4x4 which equals the number 64.
Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".
75 is not a Perfect number.
No. 6 is a perfect number, but not 7.
No, 12 is not a perfect number. It is abundant.