0.2689×10230.2689 \times 10^{23}0.2689×1023
2.689×10232.689 \times 10^{23}2.689×1023
26.89×102326.89 \times 10^{23}26.89×1023
0.02689×10230.02689 \times 10^{23}0.02689×1023