Numerosidad Number Atlas
The number 8, visualized
Eight is simultaneously a perfect cube, a Fibonacci number, and a power of two, making it an unusually rich one-digit value.
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Fixed-value symbol model for 8
eight ones
Eight circle-shaped fixed-value symbols worth 1 each supply the ones digit and combine to make 8.
This additive decimal model decomposes the number into repeated fixed-value symbols. Each symbol keeps its value wherever it appears, and repetitions add, so the complete pattern composes 8.
- eight ones
- 8
Number profile
Facts about 8
- Standard form
- 8
- Number name (word form)
- eight
- Expanded form
- 8
- Classification
- Even and composite
- Prime factorization
- 23
- Positive divisors (4)
- 1, 2, 4, 8
- Digits
- 1
- Digit sum
- 8
- Digital root
- 8
- Fixed-value symbols
- 8
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Why it stands out
Patterns inside 8
The number 8 shows how repeated multiplication, repeated doubling, and Fibonacci addition can arrive at the same value.
Three factors of 2 build a cube
The equation 8 = 2 × 2 × 2 = 2³ makes 8 both the cube of 2 and a power of two.
It also arrives by Fibonacci addition
The preceding Fibonacci numbers 3 and 5 add to 8, and 5 + 8 produces the next value, 13.
Its prime factorization uses only 2
Because 8 = 2³, every nontrivial positive divisor of 8 is itself a power of two.