304 (number)
{{Infobox number
| number = 304
| divisor = 1, 2, 4, 8, 16, 19, 38, 76, 152, 304
}}
304 is the natural number following 303 and preceding 305.
In mathematics
- 304 is an even composite number with two prime factors.{{Cite web |url=https://mathworld.wolfram.com/CompositeNumber.html|title=Facts about the integer|website=mathworld.wolfram.com}}
- 304 is the sum of consecutive primes in two different ways:{{Cite OEIS|A067372|Integers expressible as the sum of (at least two) consecutive primes in at least 2 ways}} It is the sum of 41+43+47+53+59+61 and of 23+29+31+37+41+43+47+53.
- 304 is a primitive semiperfect number meaning that it is a semiperfect number that is not divisible by any other semiperfect number.{{Cite OEIS|A006036|Primitive pseudoperfect numbers}}
- 304 is an untouchable number meaning that it is not equal to the sum of any number’s proper divisors.{{Cite OEIS|A005114|Untouchable numbers, also called non aliquot numbers: impossible values for the sum of aliquot parts function (A001065)}}
- 304 is a nontotient number meaning that it is an even number where phi(x) cannot result in that number.{{Cite OEIS|A005277|2=Nontotients: even numbers k such that phi(m) = k has no solution}}