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-22
It is not a natural number but it is an integer and a real number.
60
The first integer must equal 77 - 69 = 8 , since doubling it increases the sum by this amount. Similarly, the second integer must = 91 - 69 = 22. Then the third integer is 69 - 22 - 8 = 39.
Like any other integer, 22 expressed as an exponent is 22^1. The prime factorization of 22 is 2 x 11. No exponents are required.