81685 (number)

81685 is an odd 5-digits composite number following 81684 and preceding 81686. In scientific notation, it is written as 8.1685 × 10^4. The sum of its digits is 28. It has a total of 4 prime factors and 12 positive divisors. There are 59520 positive integers (up to 81685) that are relatively prime to 81685.

Interesting facts

Basic properties

Name

Name eighty-one thousand six hundred eighty-five

Notation

Scientific notation 8.1685 × 10^4
Engineering notation 8.1685 × 10^3

Prime Factorization of 81685

Prime Factorization 5 × 17 × 31 × 31

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 4
Total number of prime factors
rad Radical 2635
Product of the distinct prime numbers

The prime factorization of 81685 is 5 × 17 × 31 × 31. Since it has a total of 4 prime factors.

Most popular turbo-numbers

10, 8, 51, 72, 326, 706, 4859, 790, 24725, 49871, 929546, 519653, 8533074, 5502569, 42046801, 41319674, 70728986, 850558987, 9054322566, 8221816381

Basic calculations (n = 81685)

Multiplication

n×y
n×2 163370
n×3 245055
n×4 326740
n×5 408425

Division

n÷y
n÷2 40842.5
n÷3 27228.333333333
n÷3 20421.25
n÷5 16337

Exponentiation

ny
n2 6672439225
n3 545038198094125
n4 4.4521445211319E+19
n5 3.6367342520866E+24

Nth Root

y√n
2√n 285.80587817608
3√n 43.389112915413
4√n 16.905794219027
5√n 9.6034761615434

Divisors of 81685

1, 5, 17, 31, 85, 155, 527, 961, 2635, 4805, 16337, 81685

12 divisors

τ Total Divisors 12
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81684
Sum of the proper positive divisors of n
A Arithmetic Mean 0.083333333333333
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 1
Returns the nth root of the product of n divisors
H Harmonic Mean 12
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81685 can be divided by 12 positive divisors. The sum of these divisors (counting 81685) is 1, the average is 0.083333333333333.

Base conversion 81685

Base System Value
2 Binary 10011111100010101
3 Ternary 11011001101
4 Quaternary 103330111
5 Quinary 10103220
6 Senary 1430101
8 Octal 237425
10 Decimal 81685
12 Duodecimal 3b331
16 Hexadecimal 13f15
20 Vigesimal a445
36 Base36 1r11

Cryptographic Hash Functions

md5 7981662e179084185ce8f10afda245e5
sha1 f0fed18d28da563eac56168862f20449dfd2dc57
sha256 0e5b89d1d256d7790086caf0b198e9dfc79e5bea05d8a550139a8bedefeb248a
sha512 d31bd37fe6d05e14f567a242dc1c2c15de9c83acc5174c78c2821bd95466096bc8777b68e9bfa0a994ccecb5baf60428a2344da4c670c24673a9d56a37d2404b
ripemd-160 67d8981e1f995c346821924b2b8c39e29f272632

81685 as geometric shapes

Circle

Radius = n
Diameter 163370
Circumference 513241.99181696
Area 20962086050.784

Sphere

Radius = n
Volume 2.2830506654111E+15
Surface area 83848344203.137
Circumference 513241.99181696

Square

Length = n
Perimeter 326740
Area 6672439225
Diagonal 115520.03484245

Cube

Length = n
Surface area 40034635350
Volume 545038198094125
Space diagonal 141482.57021626

Equilateral Triangle

Length = n
Perimeter 245055
Area 2889250937.0289
Altitude 70741.285108132

Triangular Pyramid

Length = n
Surface area 2889250937.0289
Volume 64233367646342
Height 38506.678280815