81661806 is an even 8-digits composite number following 81661805
and preceding 81661807 . In scientific notation, it is written as 8.1661806 × 10^7.
The sum of its digits is 36. It has a total of 3 prime factors and 8 positive divisors.
There are 27220596 positive integers (up to 81661806) that are relatively prime to 81661806.
81661806 has 8 divisors, whose sum is 136103040
The reverse of 81661806 is 60816618
Previous prime number is 9
Is Prime? no
Number parity even
Number length 8
Sum of Digits 36
Digital Root 9
Name
eighty-one million six hundred sixty-one thousand eight hundred six
Scientific notation
8.1661806 × 10^7
Engineering notation
8.1661806 × 10^6
Prime Factorization
2 × 9 × 4536767
Composite number
ω
Distinct Factors
3
Total number of distinct prime factors
Ω
Total Factors
3
Total number of prime factors
rad
Radical
81661806
Product of the distinct prime numbers
The prime factorization of 81661806 is 2 × 9 × 4536767.
Since it has a total of 3 prime factors.
9 , 4 , 13 , 65 , 371 , 323 , 9446 , 6573 , 81979 , 49585 , 799198 , 996144 , 9178017 , 9928357 , 74009511 , 36287841 , 511052040 , 273793279 , 20005399 , 3195102342
n×2
163323612
n×3
244985418
n×4
326647224
n×5
408309030
n÷2
40830903
n÷3
27220602
n÷3
20415451.5
n÷5
16332361.2
n2
6668650559181636
n3
5.4457404824568E+23
n4
4.4470900280474E+31
n5
3.6315740313494E+39
2 √n
9036.6922045625
3 √n
433.85005827817
4 √n
95.061518000516
5 √n
38.22995581502
8 divisors
τ
Total Divisors
8
Total number of the positive divisors of n
σ
Sum of Divisors
1
Sum of all the positive divisors of n
s
Aliquot Sum
-81661805
Sum of the proper positive divisors of n
A
Arithmetic Mean
0.125
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
8
Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 81661806 can be divided by 8 positive divisors.
The sum of these divisors (counting 81661806) is 1, the average is 0.125.
Base
System
Value
2
Binary
100110111100000111101101110
3
Ternary
12200122211221100
4
Quaternary
10313200331232
5
Quinary
131401134211
6
Senary
12034143530
8
Octal
467407556
10
Decimal
81661806
12
Duodecimal
23421ba6
16
Hexadecimal
4de0f6e
20
Vigesimal
15a7ea6
36
Base36
1cmani
md5
4987af8cf940ce36df8095206b290689
sha1
4d98ba570460dc519f1801d76e4549ad29ac4b22
sha256
372fd39580ba06d744cb4eb5936615e2867c6b2e0a880c1fb88dafc65150ceaf
sha512
cd336dde97fed5a49aeaf20df16235ab6f0b056eac1a3a370423f85107f8bc7c534c34654233a2c7eefe9b3f6bb4d6f9875b0a5a046e26d653213353ce41eb83
ripemd-160
43036ab460d74b69b6666c6ccd013fd3e7d53079
Diameter
163323612
Circumference
513096259.61695
Area
2.0950183606082E+16
Volume
2.2811064390724E+24
Surface area
8.380073442433E+16
Circumference
513096259.61695
Perimeter
326647224
Area
6668650559181636
Diagonal
115487233.57308
Surface area
40011903355089816
Volume
5.4457404824568E+23
Space diagonal
141442397.02983
Perimeter
244985418
Area
2.8876103966063E+15
Altitude
70721198.514916
Surface area
2.8876103966063E+15
Volume
6.4178667062122E+22
Height
38495744.52436