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.
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.
Arabic numeral spelling, very common in horizontal writing and for the time sense.
Abbreviated kanji spelling; rarely used in modern Japanese.
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.