numeric
27; twenty-seven
The number 27. Both readings にじゅうしち and にじゅうなな are used; にじゅうしち is more common in careful speech, while にじゅうなな is often preferred in counting to avoid confusion with しち/いち.
クラスには二十七人の生徒がいます。
There are twenty-seven students in the class.
27ページを開いてください。
Please open to page 27.
numeric
3am; three in the morning
Only when written 27
Colloquial time expression used in contexts like late-night TV schedules or 24-hour establishments, where hours past midnight are counted as 25時, 26時, 27時, etc. Restricted to the 27 spelling in this sense.
番組は27時から放送されます。
The program will be broadcast from 3am.
Compound of 二 (に, two), 十 (じゅう, ten), and 七 (しち/なな, seven). The alternative reading にじゅうなな uses the native Japanese reading for seven.