The number 6490
6490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 11 × 59. Divisors (16): 1, 2, 5, 10, 11, 22, 55, 59, 110, 118, 295, 590, 649, 1298, 3245, 6490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 6490: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
6490 is composite. Its prime factorisation is
- 3
The divisors add up to 12960; without 6490 itself that is 6470, so 6490 is deficient (6470 is less than 6490). Euler's totient φ(6490) = 2320 numbers up to 6490 share no factor with it.
- 4
The digits of 6490 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 137 steps to reach 1.
LaTeX source of the formulas on this page
\[ 6490 = 2 \times 5 \times 11 \times 59 \]
6490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 12960 |
| Euler totient φ(n) | 2320 |
| Square | 42120100 |
| Cube | 273359449000 |
| Square root | 80.560536 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 137 |
| Scientific notation | 6.49 × |
6490 in other forms
| Form | Value |
|---|---|
| In words | six thousand four hundred and ninety |
| Binary (base 2) | 1100101011010 |
| Octal (base 8) | 14532 |
| Hexadecimal (base 16) | 195A |
| Base 3 | 22220101 |
| As time | 6490 seconds = 1 h 48 min 10 s |
Is 6490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (6490 ÷ 2 = 3245) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (6490 ÷ 5 = 1298) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (6490 ÷ 10 = 649) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (6490 ÷ 11 = 590) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 6490 a prime number?
No. 6490 = 2 × 5 × 11 × 59, so it is divisible by 2.
What are the factors of 6490?
1, 2, 5, 10, 11, 22, 55, 59, 110, 118, 295, 590, 649, 1298, 3245, 6490.
What is 6490 in binary?
1100101011010 (hexadecimal 195A, octal 14532).
What is the square root of 6490?
About 80.5605.
Is 6490 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 6490?
6490 is a happy number: repeatedly adding the squares of its digits reaches 1.