Compare 23 vs 28

Typeprimecomposite number
Unique factors12
Total factors13
Prime factorization23122 × 71
Prime factorization232 × 2 × 7
Divisors count26
Divisors1, 231, 2, 4, 7, 14, 28
Number of properties300
Additive primes6th 
Chen primes9th 
Class 1+ primes7th 
Cousin primes (2nd member)4th 
Factorial primes5th 
Happy primes4th 
Harmonic primes4th 
Isolated primes2nd 
Kynea primes3rd 
Left-truncatable primes7th 
Long primes4th 
Pierpont primes of the 2nd kind7th 
Prime quintuplet 2s (5th member)2nd 
Prime sextuplets (6th member)1st 
Prime triplets (3rd member)5th 
Right-truncatable primes5th 
Safe primes4th 
Sexy primes (1st member)6th 
Sexy primes (2nd member)5th 
Sexy prime quadrupletss (4th member)1st 
Sexy prime quadrupletss (3rd member)2nd 
Sexy prime triplets (2nd member)4th 
Sexy prime triplets (3rd member)3rd 
Solinas primes8th 
Sophie germain primes5th 
Thabit primes4th 
Two-sided primes5th 
Wedderburn-etherington primes4th 
Woodall primes2nd 
Roman numberalsXXIIIXXVIII
Base 2101112111002
Base 3212310013
Base 411341304
Base 54351035
Base 6356446
Base 7327407
Base 8278348
Base 9259319
Base 1023102810
Base 1121112611
Base 121b122412
Base 131a132213
Base 1419142014
Base 1518151d15
Base 1617161c16
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