1. Numbers
  2. Compare 13 vs 28

Compare 13 vs 28

Property1328
Typeprimecomposite number
Unique factors12
Total factors13
Prime factorization13122 × 71
Prime factorization132 × 2 × 7
Divisors count26
Divisors1, 131, 2, 4, 7, 14, 28
Number of properties320
Centered square primes2nd 
Chen primes6th 
Cousin primes (1st member)3rd 
Cuban primes 21st 
Emirps1st 
Fibonacci primes4th 
Happy primes2nd 
Harmonic primes2nd 
Left-truncatable primes5th 
Lucky primes3rd 
Multiplicative primes5th 
Pierpont primes5th 
Primes6th 
Prime quadruplets (2nd member)2nd 
Prime quadruplets (4th member)1st 
Prime quintuplet 1s (3rd member)1st 
Prime quintuplet 2s (2nd member)2nd 
Prime quintuplet 2s (4th member)1st 
Prime sextuplets (3rd member)1st 
Prime triplets (1st member)4th 
Prime triplets (2nd member)3rd 
Prime triplets (3rd member)2nd 
Proth primes3rd 
Pythagorean primes2nd 
Sexy primes (1st member)4th 
Sexy primes (2nd member)2nd 
Sexy prime triplets (2nd member)2nd 
Solinas primes5th 
Thabit primes of the 2nd kind2nd 
Twin primes (2nd member)3rd 
Ulam primes4th 
Wilson primes2nd 
Roman numberalsXIIIXXVIII
Base 211012111002
Base 3111310013
Base 43141304
Base 52351035
Base 6216446
Base 7167407
Base 8158348
Base 9149319
Base 1013102810
Base 1112112611
Base 1211122412
Base 1310132213
Base 14d142014
Base 15d151d15
Base 16d161c16
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