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28 in words

28

twenty-eight

28 is written twenty-eight.

Ways to write it

As an ordinal: twenty-eighth
Roman numeral: XXVIII
Expanded form: 20 + 8

Place value

Place	Digit	Value
tens	2	20
ones	8	8

Number facts

Even or odd: Even
Prime or composite: Composite
Factors: 1, 2, 4, 7, 14 and 28 (6 factors)
First 10 multiples: 28, 56, 84, 112, 140, 168, 196, 224, 252, 280
Square: 28 × 28 = 784
Square root: ≈ 5.29
Sum of the digits: 2 + 8 = 10
Rounded to the nearest 10: 30
Number before: 27
Number after: 29
In binary: 11100

Quick check

What number comes just after 28?
Show the answer
29
Is 28 even or odd?
Show the answer
Even
What is 28 + 10?
Show the answer
38

Practise with a game

Count with Me

Count pictures up to 5, 10 or 20 and compare groups.

Place Value Quest

Ones, tens, hundreds and thousands.

Times Tables Challenge

Practise any times table from 2× to 12×.

Frequently asked questions

How do you write 28 in words?

28 is written "twenty-eight".

Is 28 a prime number?

No. 28 is a composite number, because it has more than two factors.

What are the factors of 28?

The factors of 28 are 1, 2, 4, 7, 14 and 28.

How do you write 28 in Roman numerals?

28 in Roman numerals is XXVIII.