153 = 13 + 53 + 33 Also: 370 = 33 + 73 + 03 371 = 33 + 73 + 13 407 = 43 + 03 + 73 See the Related Links for "Exponentiated digit sums" to the bottom for more...
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Three significant digits.
3.5 million = 3500000 so 7 Seven digits (individually). Three digits (not counting repeats).
The second three digits in a phone number refer to an exchange. An exchange includes several thousand people or phones.
The largest number with three digits is 999.
Three.