642 in words
642
six hundred and forty-two
642 is written six hundred and forty-two.
Ways to write it
- As an ordinal
- six hundred and forty-second
- Roman numeral
- DCXLII
- Expanded form
- 600 + 40 + 2
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 6 | 600 |
| tens | 4 | 40 |
| ones | 2 | 2 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 6, 107, 214, 321 and 642 (8 factors)
- First 10 multiples
- 642, 1,284, 1,926, 2,568, 3,210, 3,852, 4,494, 5,136, 5,778, 6,420
- Square
- 642 × 642 = 412,164
- Square root
- ≈ 25.34
- Sum of the digits
- 6 + 4 + 2 = 12
- Rounded to the nearest 10
- 640
- Rounded to the nearest 100
- 600
- Number before
- 641
- Number after
- 643
- In binary
1010000010
Quick check
What number comes just after 642?
Show the answer
643
Is 642 even or odd?
Show the answer
Even
What is 642 + 10?
Show the answer
652
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 642 in words?
642 is written "six hundred and forty-two".
Is 642 a prime number?
No. 642 is a composite number, because it has more than two factors.
What are the factors of 642?
The factors of 642 are 1, 2, 3, 6, 107, 214, 321 and 642.
How do you write 642 in Roman numerals?
642 in Roman numerals is DCXLII.