Original: World. CIA World Handbook Therefore,  the worldwide human population density is around 7,500,000,000 510,000,000 = 14.7 per km2 (38 per sq. mi.).
Revised: World. CIA World Handbook Therefore, the worldwide human population density is approximately 7,500,000,000 510,000,000 = 14.7 per km2 (38 per sq. mi.).
Edit intent: clarity