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These occur since 1 = 10/10, 2 = 10/5, and 5 = 10/2. Note that 10 is not an aliquot part of 10 since it is not a proper quotient, i.e. a quotient different from the number itself. A perfect number is defined to be one which is equal to the sum of its aliquot parts.
Definition of future perfect from the Collins English Dictionary Numbers There are two common kinds of number: Cardinal numbers are used in all forms of counting that involve a total. one chair two chairs a hundred people ten thousand pounds Ordinal numbers ...