As a number it is: 700,000,000
7,000,707 = seven million, seven hundred and seven
you don't you write two hundred million, seven thousand. but...
7,000,707
5,700,000 five million seven hundred thousand
You can write three million seven hundred fifty thousand as 3,750,000.
Six million, seven thousand two hundred
Seven million seven hundred thousand 7,700,000
You can write that as you wrote in the question: "4.76 million". This would be pronounced as "4 point seven six million". You can also write it as "4 million, seven-hundred and sixty thousand".
Three point seven million Three million, seven hundred thousand
===> 757,000,000
seven hundred seventy-seven million
47,000,000Forty-seven million