Compare 3 vs 28

Typeprimecomposite number
Unique factors12
Total factors13
Prime factorization3122 × 71
Prime factorization32 × 2 × 7
Divisors count26
Divisors1, 31, 2, 4, 7, 14, 28
Number of properties290
Additive primes2nd 
Chen primes2nd 
Class 1+ primes2nd 
Cousin primes (1st member)1st 
Cullen primes1st 
Euclid primes2nd 
Factorial primes2nd 
Fermat primes1st 
Fibonacci primes2nd 
Left-truncatable primes2nd 
Leyland primes1st 
Lucas primes2nd 
Lucky primes1st 
Mersenne primes1st 
Multiplicative primes2nd 
Palindromic primes2nd 
Pierpont primes2nd 
Pierpont primes of the 2nd kind2nd 
Proth primes1st 
Right-truncatable primes2nd 
Solinas primes1st 
Sophie germain primes2nd 
Super primes1st 
Twin primes (1st member)1st 
Two-sided primes2nd 
Ulam primes2nd 
Wagstaff primes1st 
Wedderburn-etherington primes2nd 
Roman numberalsIIIXXVIII
Base 2112111002
Base 310310013
Base 4341304
Base 5351035
Base 636446
Base 737407
Base 838348
Base 939319
Base 103102810
Base 113112611
Base 123122412
Base 133132213
Base 143142014
Base 153151d15
Base 163161c16
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