28

27 ← 28 → 29
읽는 법이십팔
세는 법스물여덟
한자二十八
소인수 분해22× 7
로마 숫자XXVIII
2진수111002
3진수10013
4진수1304
5진수1035
6진수446
8진수348
12진수2412
16진수1C16
20진수1820
36진수S36
φ(28)12
σ*(28)40
d(28)6
σ(28)56
μ(28)0
M(28)-1
수 목록 · 정수

28(이십팔)은 27보다 크고 29보다 작은 자연수다.

수학

  • 7번째 삼각수다. 앞의 삼각수는 21, 다음 삼각수는 36이다.
  • 연속하는 다섯 소수 2, 3, 5, 7, 11의 합이다.
  • 200 이하의 7의 배수는 28개다.

과학

교통

방송

스포츠

작품

  • 《28》(2013): 대한민국의 소설가 정유정의 소설.
  • 《28》: 대한민국의 음악 그룹 옥상달빛의 첫 번째 정규 음반. 2011년 4월 26일 출시.
  • 《28년 후》(2025): 2025년 개봉 예정인 미국·영국의 공포 영화.
  • 《철인 28호》

기타

이 글은 숫자에 관한 토막글입니다. 여러분의 지식으로 알차게 문서를 완성해 갑시다.

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