$380000=3,8\cdot 100000=3,8\cdot {10}^5$

$150000000=1,5\cdot 100000000=1,5\cdot {10}^8$

$55000000=5,5\cdot 10000000=55\cdot {10}^7$

$4070000000000000=4,07\cdot 1000000000000000=407\cdot {10}^{15}$

$41500000000000=4,15\cdot 10000000000000=4,15\cdot {10}^{13}$