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Number 28
Representations of 28
Greek numeral
κηʹ
Arabic numeral
٢٨
Roman numeral
XXVIII
Maya numeral
●
●●●
▃▃▃▃▃
Chinese numeral
二十八
Hebrew numeral
כח
28 in different numeral systems
Binary
11100
Base-3
1001
Base-4
130
Base-5
103
Base-6
44
Base-7
40
Base-8
34
Hex
1c
Base-24
14
Base-36
s
Factorization
Prime factors
2
,
7
Divisors
1
,
2
,
4
,
7
,
14
,
28
Sum of divisors other than 28
28
Perfect number
Product of prime factors
28 =
2
x
2
x
7
Characteristics
Triangular
Hexagonal
Even
Ones-Zeroes
Composite
Related primes
Number 28 prime
107
Prime number before 28
23
Prime number after 28
29