81721805 (number)

81721805 is an odd 8-digits composite number following 81721804 and preceding 81721806. In scientific notation, it is written as 8.1721805 × 10^7. The sum of its digits is 32. It has a total of 4 prime factors and 16 positive divisors. There are 55937280 positive integers (up to 81721805) that are relatively prime to 81721805.

Interesting facts

Basic properties

Name

Name eighty-one million seven hundred twenty-one thousand eight hundred five

Notation

Scientific notation 8.1721805 × 10^7
Engineering notation 8.1721805 × 10^6

Prime Factorization of 81721805

Prime Factorization 5 × 17 × 11 × 87403

Composite number
ω Distinct Factors 4
Total number of distinct prime factors
Ω Total Factors 4
Total number of prime factors
rad Radical 81721805
Product of the distinct prime numbers

The prime factorization of 81721805 is 5 × 17 × 11 × 87403. Since it has a total of 4 prime factors.

Most popular turbo-numbers

5, 6, 9, 100, 22, 762, 4683, 3362, 30390, 47162, 820632, 183792, 629724, 2919361, 4697098, 78181722, 582647131, 789057790, 3166955492, 4544875949

Basic calculations (n = 81721805)

Multiplication

n×y
n×2 163443610
n×3 245165415
n×4 326887220
n×5 408609025

Division

n÷y
n÷2 40860902.5
n÷3 27240601.666667
n÷3 20430451.25
n÷5 16344361

Exponentiation

ny
n2 6678453412458025
n3 5.4577526747448E+23
n4 4.4601739982372E+31
n5 3.6449346975001E+39

Nth Root

y√n
2√n 9040.0113384885
3√n 433.95628581348
4√n 95.078974218743
5√n 38.235571868387

Divisors of 81721805

1, 5, 11, 17, 55, 85, 187, 935, 87403, 437015, 961433, 1485851, 4807165, 7429255, 16344361, 81721805

16 divisors

τ Total Divisors 16
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81721804
Sum of the proper positive divisors of n
A Arithmetic Mean 0.0625
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 16
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81721805 can be divided by 16 positive divisors. The sum of these divisors (counting 81721805) is 1, the average is 0.0625.

Base conversion 81721805

Base System Value
2 Binary 100110111101111100111001101
3 Ternary 12200202220020112
4 Quaternary 10313233213031
5 Quinary 131410044210
6 Senary 12035325405
8 Octal 467574715
10 Decimal 81721805
12 Duodecimal 23450865
16 Hexadecimal 4def9cd
20 Vigesimal 15af4a5
36 Base36 1cnky5

Cryptographic Hash Functions

md5 152777cd70af609da62df0c792a37046
sha1 6862cc7698828e08cbc4911e516a8b129b15fcac
sha256 eb132cc983ed3780874903c2cd45879d33699cb682374437d45dfb8b27fd5ca7
sha512 b411ac0eb3eb847cfaeb31eae1f41399338afc5eae9830b66623f895b99f3a917ce535957f43544a2448053e18bf3a84bfdf7df9e0477b5e809bb354bb083b36
ripemd-160 a6a1238ac913a292e55738c114706cde372e5c32

81721805 as geometric shapes

Circle

Radius = n
Diameter 163443610
Circumference 513473244.4522
Area 2.098098017792E+16

Sphere

Radius = n
Volume 2.2861380944118E+24
Surface area 8.3923920711679E+16
Circumference 513473244.4522

Square

Length = n
Perimeter 326887220
Area 6678453412458025
Diagonal 115572084.97261

Cube

Length = n
Surface area 40070720474748150
Volume 5.4577526747448E+23
Space diagonal 141546318.34624

Equilateral Triangle

Length = n
Perimeter 245165415
Area 2.8918551565898E+15
Altitude 70773159.173118

Triangular Pyramid

Length = n
Surface area 2.8918551565898E+15
Volume 6.4320232105851E+22
Height 38524028.324203