The number 61490
61490 is a composite number with 32 divisors. Its prime factorisation is 2 × 5 × 11 × 13 × 43. Divisors (32): 1, 2, 5, 10, 11, 13, 22, 26, 43, 55, 65, 86, 110, 130, 143, 215 … 61490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61490 is composite. Its prime factorisation is
- 3
The divisors add up to 133056; without 61490 itself that is 71566, so 61490 is abundant (71566 is more than 61490). Euler's totient φ(61490) = 20160 numbers up to 61490 share no factor with it.
- 4
The digits of 61490 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61490 = 2 \times 5 \times 11 \times 13 \times 43 \]
61490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 32 |
| Sum of divisors | 133056 |
| Euler totient φ(n) | 20160 |
| Square | 3781020100 |
| Cube | 232494925949000 |
| Square root | 247.971773 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 60 |
| Scientific notation | 6.149 × |
61490 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand four hundred and ninety |
| Binary (base 2) | 1111000000110010 |
| Octal (base 8) | 170062 |
| Hexadecimal (base 16) | F032 |
| Base 3 | 10010100102 |
| As time | 61490 seconds = 17 h 4 min 50 s |
Is 61490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (61490 ÷ 2 = 30745) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | 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 (61490 ÷ 5 = 12298) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (61490 ÷ 10 = 6149) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (61490 ÷ 11 = 5590) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61490 a prime number?
No. 61490 = 2 × 5 × 11 × 13 × 43, so it is divisible by 2.
What are the factors of 61490?
1, 2, 5, 10, 11, 13, 22, 26, 43, 55, 65, 86, 110, 130, 143, 215, 286, 430, 473, 559, 715, 946, 1118, 1430, 2365, 2795, 4730, 5590, 6149, 12298, 30745, 61490.
What is 61490 in binary?
1111000000110010 (hexadecimal F032, octal 170062).
What is the square root of 61490?
About 247.9718.
Is 61490 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 61490?
It is a composite number with 32 divisors.