278 (number)

← 277 278 279 →
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Cardinal	two hundred seventy-eight
Ordinal	278th (two hundred seventy-eighth)
Factorization	2 × 139
Divisors	1, 2, 139, 278
Greek numeral	ΣΟΗ´
Roman numeral	CCLXXVIII, cclxxviii
Binary	1000101102
Ternary	1010223
Senary	11426
Octal	4268
Duodecimal	1B212
Hexadecimal	11616

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]

See also

• List of highways numbered 278

References

1. "Composite numbers". mathworld.wolfram.com.
2. Sloane, N. J. A. (ed.). "SequenceA002088". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. "Nontotient numbers". mathworld.wolfram.com.
4. "Semiprime numbers". mathworld.wolfram.com.