What is the value of this number?

I've just done quite a big calculation on the calculator on my iPhone and the answer has came up as

3.165559e+7

Could someone please explain what the e+7 means and tell me the entire number please?

E+7 = 10^7

So 3.165559e+7 = 3.165559 x 10^7 = 31,655,590