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Hace 13 horas · 8 is the third refactorable number, as it has exactly four positive divisors, and 4 is one of them. 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 first number to be the aliquot sum of two numbers: the discrete semiprime 10 = 5 × 2, and squared prime 49 = 7 2.
