He is a biological thermonuclear furnace. He can emit pulses of radiation, not only nuclear, but also thermal, and photonic.
He has supersonic flight, and can shoot atomic, thermal, and phonotic blasts, and concentrated beams from his hands.
He can also absorb massive amounts of energy/radiation to add to his attacks.
When at full power he has the ability of subatomic manipulation, meaning he can manipulate the atomic bonds of atoms and use fission and fusion to either destroy, or create. He only can do this for a limited amount of time.