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4 ore fa · Enter the American Songwriter Song Contest and get your songs in front of #1 songwriters/artists + A&R executives. Win $10K & a lot more!
9 ore fa · 6 is the root of the 6-aliquot tree, and is itself the aliquot sum of only one other number; the square number 25. Six is the first unitary perfect number, since it is the sum of its positive proper unitary divisors, without including itself. Only five such numbers are known to exist; sixty (10 × 6) and ninety (15 × 6) are the next two.
