The number 77465
77465 is a composite number with 4 divisors. Its prime factorisation is 5 × 15493. Divisors (4): 1, 5, 15493, 77465.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77465: a semiprime: 5 × 15493, the product of two primes.
- 2
77465 is composite. Its prime factorisation is
- 3
The divisors add up to 92964; without 77465 itself that is 15499, so 77465 is deficient (15499 is less than 77465). Euler's totient φ(77465) = 61968 numbers up to 77465 share no factor with it.
- 4
The digits of 77465 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77465 = 5 \times 15493 \]
77465 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 92964 |
| Euler totient φ(n) | 61968 |
| Square | 6000826225 |
| Cube | 464854003519625 |
| Square root | 278.325349 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 138 |
| Scientific notation | 7.7465 × |
77465 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand four hundred and sixty-five |
| Binary (base 2) | 10010111010011001 |
| Octal (base 8) | 227231 |
| Hexadecimal (base 16) | 12E99 |
| Base 3 | 10221021002 |
| As time | 77465 seconds = 21 h 31 min 5 s |
Is 77465 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 2) | 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 | Yes (77465 ÷ 5 = 15493) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 1) | 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 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 77465 a prime number?
No. 77465 = 5 × 15493, so it is divisible by 5.
What are the factors of 77465?
1, 5, 15493, 77465.
What is 77465 in binary?
10010111010011001 (hexadecimal 12E99, octal 227231).
What is the square root of 77465?
About 278.3253.
Is 77465 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 77465?
77465 is a semiprime: 5 × 15493, the product of two primes.