6 is the 1st perfect number...........28 is the 2nd one..............there are 6.28 pi radians.........in a circle's circumference..................



Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6. The next perfect number is 28 = 1 + 2 + 4 + 7 + 14. This is followed by the perfect numbers 496 and 8128 (sequence A000396 in the OEIS).

Perfect number - Wikipedia

https://en.wikipedia.org/wiki/Perfect_number

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Why is the number 7 the perfect number?

Christianity. Christian denominations consider seven to be a holy number because Genesis says that God rested on the 7th day and man was created on the 6th day.