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2. 40 (number) - Wikipedia

   en.wikipedia.org/wiki/40_(number)

   40 is the smallest number with exactly nine solutions to the equation Euler's totient function (for values 41, 55, 75, 82, 88, 100, 110, 132, and 150 of ). Adding up some subsets of the divisors of 40 (e.g., 1, 4, 5, 10, and 20) gives 40; hence, 40 is the ninth semiperfect number. [ 7] 40 is also the ninth refactorable number.