555,000,000 km !
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4.3 billion kilometers in full numbers is 4,300,000,000 kilometers. This is because each billion is equivalent to one thousand million, so 4.3 billion is equal to 4,300 million. Therefore, when converted to full numbers, 4.3 billion km is written as 4,300,000,000 km.
1 million = 1,000,000 → 778 million km = 778 × 1,000,000 km = 778,000,000 km Also, 1 million = 10⁶ → 778 million km = 778 × 10⁶ km = 7.78 × 10⁸ km
There are 1000 km in 1 million cm.
9.6 million sq km = 3.707 million sq miles
Most reference works list Africa second with 30 million square km, and while I've seen a few different numbers for Asia, all of them were over 43 million.