Well the answer should be about 59.7 million, but the point presented by @samotonakatoshi is very valid, first off what is called a billion in the US is not a billion in other parts, a billion would be 1 million * 1 million, and likewise for a trillion, 1 billion*1 billion, in some other parts they just add six zeroes to a million to make a billion and 6 zeroes to a billion to make a trillion etc. in the English speaking countries they add three zeroes . In spanish we have a word "millardo" which represents what in the US is a billion. So I guess you have to take your pick, and at least in this respect mathematics is not exact.