191 People
In 1950 a national census was conducted in Japan, and 284,000 survivors of the A-bombs were identified.
2,224 were on board and only 705 survived (picked up by Carpathia)
89
If you're talking about who survived BOTH, then the only person on the planet who has survived both bombings is Tsutomu Yamaguchi. If your talking about how many, I'm not sure...