The number 76021
76021 is a composite number with 4 divisors. Its prime factorisation is 11 × 6911. Divisors (4): 1, 11, 6911, 76021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 76021: a semiprime: 11 × 6911, the product of two primes.
- 2
76021 is composite. Its prime factorisation is
- 3
The divisors add up to 82944; without 76021 itself that is 6923, so 76021 is deficient (6923 is less than 76021). Euler's totient φ(76021) = 69100 numbers up to 76021 share no factor with it.
- 4
The digits of 76021 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 169 steps to reach 1.
LaTeX source of the formulas on this page
\[ 76021 = 11 \times 6911 \]
76021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 82944 |
| Euler totient φ(n) | 69100 |
| Square | 5779192441 |
| Cube | 439339988557261 |
| Square root | 275.719060 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 169 |
| Scientific notation | 7.6021 × |
76021 in other forms
| Form | Value |
|---|---|
| In words | seventy-six thousand and twenty-one |
| Binary (base 2) | 10010100011110101 |
| Octal (base 8) | 224365 |
| Hexadecimal (base 16) | 128F5 |
| Base 3 | 10212021121 |
| As time | 76021 seconds = 21 h 7 min 1 s |
Is 76021 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (76021 ÷ 11 = 6911) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 76021 a prime number?
No. 76021 = 11 × 6911, so it is divisible by 11.
What are the factors of 76021?
1, 11, 6911, 76021.
What is 76021 in binary?
10010100011110101 (hexadecimal 128F5, octal 224365).
What is the square root of 76021?
About 275.7191.
Is 76021 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 76021?
76021 is a semiprime: 11 × 6911, the product of two primes.