![]() 8 is the first number to be the aliquot sum of two numbers: the discrete semiprime 10, and the squared prime 49.8 is the only composite number with a prime aliquot sum of 7 (1 + 2 + 4) that is part of the aliquot sequence (8, 7, 1, 0).8 is the third refactorable number, as it has exactly four positive divisors, and 4 is one of them.It is also the only positive Fibonacci number aside from 1 that is a perfect cube. 8 is the sixth Fibonacci number and the first even, non-prime Fibonacci number. ![]()
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