Write out numbers used figuratively:
Numbers in the millions or higher should be written as a combination of words and figures:
When such compound numbers are used adjectivally, insert hyphens between the components (see 5.05 Adjectival expressions and juxtaposed numbers):
Whether or not it is used adjectivally, the entire number (numeral and word) should appear on the same line.
Numbers with a long succession of zeros should normally be rewritten. Thus 2.6 million is preferable to 2 600 000.
Numbers are normally rounded to no more than three significant digits. Thus 2 653 000 becomes 2.65 million, not 2.653 million.
The proper form for large numbers that must be written in full is as illustrated:
The practice of writing a number in full and then repeating it in numerals in parentheses should be reserved for legal documents:
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