Compare 5 vs 28

Typeprimecomposite number
Unique factors12
Total factors13
Prime factorization5122 × 71
Prime factorization52 × 2 × 7
Divisors count26
Divisors1, 51, 2, 4, 7, 14, 28
Number of properties360
Additive primes3rd 
Bell primes2nd 
Centered square primes1st 
Chen primes3rd 
Class 1+ primes3rd 
Dihedral primes2nd 
Factorial primes3rd 
Fermat primes2nd 
Fibonacci primes3rd 
Good primes1st 
Harmonic primes1st 
Left-truncatable primes3rd 
Multiplicative primes3rd 
Palindromic primes3rd 
Pierpont primes3rd 
Pierpont primes of the 2nd kind3rd 
Prime quadruplets (1st member)1st 
Prime quintuplet 2s (1st member)1st 
Prime triplets (1st member)1st 
Proth primes2nd 
Pythagorean primes1st 
Restricted left-truncatable primes2nd 
Right-truncatable primes3rd 
Safe primes1st 
Sexy primes (1st member)1st 
Sexy prime quadrupletss (1st member)1st 
Sexy prime triplets (1st member)1st 
Solinas primes2nd 
Sophie germain primes3rd 
Super primes2nd 
Thabit primes2nd 
Twin primes (1st member)2nd 
Twin primes (2nd member)1st 
Two-sided primes3rd 
Wilson primes1st 
Roman numberalsVXXVIII
Base 21012111002
Base 312310013
Base 41141304
Base 51051035
Base 656446
Base 757407
Base 858348
Base 959319
Base 105102810
Base 115112611
Base 125122412
Base 135132213
Base 145142014
Base 155151d15
Base 165161c16
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