How may stones did hanuman throne on lanka?

387,671 stones. The trick here is to give a number that is convincing

None. Stones were not thrown on Lanka, stone were thrown in sea to build the bridge to lanka.

92741860000 number of stones. if you disagree prove me wrong..!!

Nor Hanumaan, Nal and Neel thrown the stones in sea to build a bridge to lanka.

approx.num of stones=wt. of water displaced/avg.wt of stone.

5678888 stones

@ "approx.num of stones=wt. of water displaced/avg.wt of stone."this will come less then 1:D . . . . .

as much required to reach lanka

Correct, Nal and Neel are the only ones who threw the stone. The reason being they were cursed by a wise sage to have everything they threw into the water float. However, Hanuman did incribe Ram's (Rama's) name onto each stone during the construction of the bridge. With the help of Lord Shive and the Ocean god and the religious merite of Ram, the bridge was completed in 5 Days.

The stones thrown were equal number of hairs on his body.

It does not matters how many stones he thrown it only matters he crosses the sea.

Stones were not thrown on Lanka, stone were thrown in sea to build the bridge to lanka.