278 (two hundred [and] seventy-eight) is the natural number following 277 and preceding 279.
In mathematics
- 278 is an even composite number with 2 prime factors.[1]
- 278 is equal to Φ(30). It is the sum of the totient function.[2]
- 278 is a nontotient number which means that it is an even number that doesn't follow Euler's totient function.[3]
- 278 is the smallest semiprime number that has an anagram that is also semiprime. The other number is 287.[4]
References
- ^ "Composite numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A002088". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Nontotient numbers". mathworld.wolfram.com.
- ^ "Semiprime numbers". mathworld.wolfram.com.
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