: How do you write a large number in a sentence? I was there for 45,400,000 (forty-five million, four hundred thousand) seconds I was there for 45,400,000, forty-five million, four hundred thousand,

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For a scientific work, I would go with something more like scientific notation:

4.54 * 10^7 (four point five four times ten to the seven)

Many engineers prefer to use only power of three exponents (3, 6, 12, 21, etc...), so then it would become:

45.4 * 10^6 (forty five point four times ten to the six)

For something less formal (where it should be okay to only use one or two decimal places any way), perhaps:

45.4 million (forty five point four million)

Personally, I can't imagine an informal situation that requires a full long hand wording of a number unless, perhaps, for the purpose of some unique rhyming or prose cadence. In this case, it would be most important to write it in a flowing lyrical manner that 'sounds good' in context rather than adhere to strict grammatical conventions.

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