81720 (number)

81720 is an even 5-digits composite number following 81719 and preceding 81721. In scientific notation, it is written as 8.1720 × 10^4. The sum of its digits is 18. It has a total of 6 prime factors and 32 positive divisors. There are 21696 positive integers (up to 81720) that are relatively prime to 81720.

Interesting facts

Basic properties

Name

Name eighty-one thousand seven hundred twenty

Notation

Scientific notation 8.1720 × 10^4
Engineering notation 8.1720 × 10^3

Prime Factorization of 81720

Prime Factorization 2 × 2 × 2 × 15 × 3 × 227

Composite number
ω Distinct Factors 4
Total number of distinct prime factors
Ω Total Factors 6
Total number of prime factors
rad Radical 20430
Product of the distinct prime numbers

The prime factorization of 81720 is 2 × 2 × 2 × 15 × 3 × 227. Since it has a total of 6 prime factors.

Most popular turbo-numbers

8, 9, 23, 98, 379, 350, 9204, 7218, 16029, 40189, 337755, 324458, 1790115, 755309, 69607435, 88907521, 446902734, 848819739, 637668710, 9784511803

Basic calculations (n = 81720)

Multiplication

n×y
n×2 163440
n×3 245160
n×4 326880
n×5 408600

Division

n÷y
n÷2 40860
n÷3 27240
n÷3 20430
n÷5 16344

Exponentiation

ny
n2 6678158400
n3 545739104448000
n4 4.4597799615491E+19
n5 3.6445321845779E+24

Nth Root

y√n
2√n 285.86710198972
3√n 43.395309084056
4√n 16.907604856683
5√n 9.6042989908818

Divisors of 81720

1, 2, 3, 4, 6, 8, 12, 15, 24, 30, 45, 60, 90, 120, 180, 227, 360, 454, 681, 908, 1362, 1816, 2724, 3405, 5448, 6810, 10215, 13620, 20430, 27240, 40860, 81720

32 divisors

τ Total Divisors 32
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81719
Sum of the proper positive divisors of n
A Arithmetic Mean 0.03125
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 32
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81720 can be divided by 32 positive divisors. The sum of these divisors (counting 81720) is 1, the average is 0.03125.

Base conversion 81720

Base System Value
2 Binary 10011111100111000
3 Ternary 11011002200
4 Quaternary 103330320
5 Quinary 10103340
6 Senary 1430200
8 Octal 237470
10 Decimal 81720
12 Duodecimal 3b360
16 Hexadecimal 13f38
20 Vigesimal a460
36 Base36 1r20

Cryptographic Hash Functions

md5 0ea29688d6b65b08a71583c223402ce6
sha1 2f37bc91e638a78bf6d4e365d880531fa1167301
sha256 ac08b07a6ee5327d42bfead3ddf8d84a3203fffe60edcc35f0d40310cba6c757
sha512 d8384851f1a4fea794e6895f53685a94f61d8f65efa4fe9ec6b3803406cd09a8f356807198b25e3afc2cbb3e927f30e0f64390c17ddb7d39405d764b22681c7b
ripemd-160 2da6b2d04d312b91d0bb8187ceadfb6a5f564126

81720 as geometric shapes

Circle

Radius = n
Diameter 163440
Circumference 513461.90330272
Area 20980053368.949

Sphere

Radius = n
Volume 2.2859866150807E+15
Surface area 83920213475.796
Circumference 513461.90330272

Square

Length = n
Perimeter 326880
Area 6678158400
Diagonal 115569.53231713

Cube

Length = n
Surface area 40068950400
Volume 545739104448000
Space diagonal 141543.19199453

Equilateral Triangle

Length = n
Perimeter 245160
Area 2891727412.4482
Altitude 70771.595997264

Triangular Pyramid

Length = n
Surface area 2891727412.4482
Volume 64315970252309
Height 38523.177439043