He moved up to the 19th global rank on the list of 2,208 billionaires worldwide compiled by Forbes. In 2017, he ranked 33rd with $23.2 billion.
The US has 585 billionaires and China 373 this year on the Forbes tally, which it calls "The Three Comma Club" for the punctuation used in writing out fully the billion in numbers.
In 2017, there were 102 Indians on the list.
Amazon founder Jeff Bezos is the world's richest man with assets valued at $112 billion, overtaking Microsoft co-founder Bill Gates whose fortunes are valued at $90 billion and investor Warren Buffet with $84 billion.
Bezos, who also owns The Washington Post newspaper, is the first person to cross the $100 billion mark in assets, Forbes said. His fortunes rose by $39.2 billion over the past year, which Forbes said is the list's biggest one-year jump ever.
Gates, who heads the world's biggest philanthropic organisation, the Bill and Melinda Gates Foundation, has donated a lot of his assets to charities.
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