Number
82
- Positive
- Even
- Composite
- 2 digits
82 is an even 2-digit integer and a composite number. It has 4 divisors and a digital root of 1.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value82
Digit count2
Digit sum10
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 41
Distinct prime factors22, 41
Number of divisors4
Sum of divisors σ(n)126
Aliquot sum44sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)40integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 41, 824 in total
Arithmetic
Representations
Decimal82
Binary10100107 bits
Octal122
Hexadecimal52
Base 362A
Roman numeralLXXXII
In wordseighty-two
Ordinaleighty-second
Scientific notation8.2 × 10^1
Engineering notation82
Nearest landmarks
Powers & multiples
82 to the power 26,724
82 to the power 3551,368
82 to the power 445,212,176
82 to the power 53,707,398,432
First ten multiples82, 164, 246, 328, 410, 492, 574, 656, 738, 820
Powers of twoBetween 2^6 (64) and 2^7 (128)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4No, remainder 2
Divisible by 5No, remainder 2
Divisible by 6No, remainder 4
Divisible by 7No, remainder 5
Divisible by 8No, remainder 2
Divisible by 9No, remainder 1
Divisible by 10No, remainder 2
Divisible by 11No, remainder 5
Divisible by 12No, remainder 10
Divisible by 100No, remainder 82
Collatz (3n + 1) trajectory
Steps to reach 1110the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps82 → 41 → 124 → 62 → 31 → 94 → 47 → 142 → 71 → 214 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage8,200%
82% as a decimal0.82
82% of 10082
82% of 1,000820
As a fraction of 10082/100
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