what is 783,216,000 in scientific notation?

7.83216 x 10^8

7.83x10^8

To turn anything into scientific notation you take all the digits that aren't zero and you put them behind a decimal point, except for the leading digit which isn't 0. So 7832161000 becomes 7.83216 x 10 to the 8 power.

7.83216x10^8

783,216,000
= 7.83216 x 10^8