Number
-78
- Negative
- Even
- 2 digits
-78 is an even 2-digit integer and the negative of 78. It has 8 divisors and a digital root of 6.
Number properties
ParityEvendivisible by 2
SignNegative
Absolute value78
Digit count2
Digit sum15
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 2 × 3 × 13
Distinct prime factors32, 3, 13
Number of divisors8
Sum of divisors σ(n)168
SquarefreeYesno repeated prime factor
All divisors1, 2, 3, 6, 13, 26, 39, 788 in total
Arithmetic
Representations
Decimal-78
Binary10011107 bits
Octal116
Hexadecimal4E
Base 3626
In wordsminus seventy-eight
Ordinalminus seventy-eighth
Scientific notation-7.8 × 10^1
Engineering notation-78
Powers & multiples
-78 to the power 26,084
-78 to the power 3-474,552
-78 to the power 437,015,056
-78 to the power 5-2,887,174,368
First ten multiples-78, -156, -234, -312, -390, -468, -546, -624, -702, -780
Powers of twoBetween 2^6 (64) and 2^7 (128)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4No, remainder 2
Divisible by 5No, remainder 3
Divisible by 6Yes
Divisible by 7No, remainder 1
Divisible by 8No, remainder 6
Divisible by 9No, remainder 6
Divisible by 10No, remainder 8
Divisible by 11No, remainder 1
Divisible by 12No, remainder 6
Divisible by 100No, remainder 78
As a percentage & fraction
As a percentage-7,800%
-78% as a decimal-0.78
-78% of 100-78
-78% of 1,000-780
As a fraction of 100-78/100
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