include Math
class Fixnum

  def factor(num=nil)
    return [] if self == 1
    factor = Range.new(num || 2,self/2).select {|x| self % x == 0}.push(self).unshift(1)
  end
end

divisors = 0
count = 0
puts (1..(1.0/0.0)).find { |x| x.factor.size > 500}.factor