Divisors of the Positive Integer 28

1, 2, 4, 7, 14, 28

Sum of all the Divisors of 28, including itself

56

Sum of the Proper Divisors of 28

28

Properties of the number 28

The integer 28 is an even number.
The integer 28 is a Composite number.
28 equals 28, so it is a Perfect number.

The number 28 as a Roman Numeral

XXVIII

The number 28 in various Numeral Systems

Base	Representation
2:	11100
3:	1001
4:	130
5:	103
6:	44
7:	40
8:	34
9:	31
10:	28
11:	26
12:	24
13:	22
14:	20
15:	1D
16:	1C
17:	1B
18:	1A
19:	19
20:	18
21:	17
22:	16
23:	15
24:	14
25:	13
26:	12
27:	11
28:	10
29:	S
30:	S
31:	S
32:	S
33:	S
34:	S
35:	S
36:	S