Number 28

Interestingness: 12 · Rank #89 of 1000

Visual representations

Binary image (n×n bits)
Element Ni – Nickel
Triangular · P3(7) = 28
Hexagonal · P6(4) = 28
2²7
Prime factorization

Representations of 28

Greek numeral
κηʹ
Sanskrit numeral
२८
Arabic numeral
٢٨
Roman numeral
XXVIII
Maya numeral
●
●●●
▃▃▃▃▃
Chinese numeral
二十八
Hebrew numeral
כח
Egyptian numeral
𓎆𓎆
𓏹𓏹𓏹𓏹𓏹𓏹𓏹𓏹
Morse code
..------..

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
Duodecimal
24
Hex
1c
Vigesimal
18
Base-24
14
Base-36
s
Negabinary
1101100

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 × 2 × 7

Number-theory characteristics (8)

Triangular Hexagonal Difference of 2 squares Odious number Even Ones-Zeroes Composite Perfect

Base-10 digit properties (1)

These depend on the decimal representation of the number.

Happy number

Related primes

Number 28 prime
Prime number before 28
Prime number after 28