Million have 6 zeros. So for 1.5 million 5 zeros. 1,500,000
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15 million = 15,000,000 (6 zeros before decimal)
15 zeroes: 1,000,000,000,000,000
15 million = 15,000,000
15 zeros
To get around the confusion between the US and European use of billion (thousand million or million million) and higher numbers new names, based on Greek roots, were proposed. In many countries the European names have now been dropped in favour of the US names. Pentillion was the name proposed for quadrillion = 1015 It would have had 15 zeros if the name had caught on.