484

This number is a composite.

sigma(484) = prime(4)*prime(8)*prime(4). 484 is the largest known (up to 10^8) such number. [Firoozbakht]

π(484) = phi(484)-4*8*4. [Firoozbakht]

(68*10^484+7)/3 is prime. [Pankajjyoti]