The membrane that surrounds a certain type of living cell has a surface area of 5.10 × 10-9 m2 and a thickness of 9.00 × 10-9 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.2. The potential on the outer surface of the membrane is +58.0 mV greater than that on the inside surface. If the charge is due to positive ions (charge +e), how many such ions are present on the outer surface?