Write each of the following numbers in standard form:

(i) $57.36=5.736 \times 10$

(ii) $3500000=3.5 \times 10^{6}$

(iii) $273000=2.73 \times 10^{5}$

(iv) $168000000=1.68 \times 10^{8}$

(v) $4630000000000=4.63 \times 10^{12}$

(vi) $345 \times 10^{5}=3.45 \times 10^{7}$