Some 18.5 million households around the world have at least USD 1 million worth of assets, for a total of USD 78.8 trillion -- or about the same size as global annual economic output -- Boston Consulting Group's annual report on global private wealth says.
That also amounts to 47 per cent of total global wealth -- based on holdings of cash, financial accounts, and equities, but not real estate -- leaving the rest to be divided by the other 99 per cent of the world's population.
The United States tops the world's count of millionaires by far, with eight million at least that wealthy, followed by China with two million millionaires and Japan with half that number.
Per capita, however, the largest concentrations of wealthy are in the tax havens of Liechtenstein and Switzerland.
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"The Asia-Pacific region is also expected to surpass Western Europe as the second wealthiest region in 2017," it added.
Despite efforts by the United States and European countries to crack down on tax evasion, the report said, offshore financial centers remain important to the world's wealthy.
Offshore tax havens hold some USD 10 trillion, an amount that grew around 3 per cent last year. The largest sources of wealth held offshore are Latin America and the Middle East.
And while Switzerland remains the world's main destination for parking offshore money, both Singapore and Hong Kong are growing much faster in the business, with around 18 per cent of the world's offshore wealth.