81645 (number)

81645 is an odd 5-digits composite number following 81644 and preceding 81646. In scientific notation, it is written as 8.1645 × 10^4. The sum of its digits is 24. It has a total of 3 prime factors and 8 positive divisors. There are 43536 positive integers (up to 81645) that are relatively prime to 81645.

Interesting facts

Basic properties

Name

Name eighty-one thousand six hundred forty-five

Notation

Scientific notation 8.1645 × 10^4
Engineering notation 8.1645 × 10^3

Prime Factorization of 81645

Prime Factorization 3 × 5 × 5443

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 3
Total number of prime factors
rad Radical 81645
Product of the distinct prime numbers

The prime factorization of 81645 is 3 × 5 × 5443. Since it has a total of 3 prime factors.

Most popular turbo-numbers

1, 5, 17, 74, 607, 568, 1672, 7056, 32546, 31586, 222882, 646630, 6007141, 3963699, 51943750, 19958497, 471220949, 425599962, 7673347043, 9716949834

Basic calculations (n = 81645)

Multiplication

n×y
n×2 163290
n×3 244935
n×4 326580
n×5 408225

Division

n÷y
n÷2 40822.5
n÷3 27215
n÷3 20411.25
n÷5 16329

Exponentiation

ny
n2 6665906025
n3 544237897411125
n4 4.4434303134131E+19
n5 3.6278386793861E+24

Nth Root

y√n
2√n 285.73589204018
3√n 43.382029412168
4√n 16.903724206227
5√n 9.6025354397179

Divisors of 81645

1, 3, 5, 15, 5443, 16329, 27215, 81645

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 -81644
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 81645 can be divided by 8 positive divisors. The sum of these divisors (counting 81645) is 1, the average is 0.125.

Base conversion 81645

Base System Value
2 Binary 10011111011101101
3 Ternary 11010222220
4 Quaternary 103323231
5 Quinary 10103040
6 Senary 1425553
8 Octal 237355
10 Decimal 81645
12 Duodecimal 3b2b9
16 Hexadecimal 13eed
20 Vigesimal a425
36 Base36 1qzx

Cryptographic Hash Functions

md5 65a0dc9604614be69b3b45d40afe1f85
sha1 7fac91c38ff07d2263cf5c571779435fa2d18317
sha256 05dcec8a3e94180b1c9c00669a3a56002d2bb24898d6e3ed461c126d16349587
sha512 65971fbf2f7b1caf5b71205c9560f80ea1d44d5f0e1a03b712a1a2b012eb891ff802b052e56154c666a84b943cb04dbfec957f70f08ebff7d484ec453f14d644
ripemd-160 2754dbb15fa4ea0d4bfc1eed351848fc133a97e5

81645 as geometric shapes

Circle

Radius = n
Diameter 163290
Circumference 512990.66440468
Area 20941561397.66

Sphere

Radius = n
Volume 2.2796983737493E+15
Surface area 83766245590.64
Circumference 512990.66440468

Square

Length = n
Perimeter 326580
Area 6665906025
Diagonal 115463.46629995

Cube

Length = n
Surface area 39995436150
Volume 544237897411125
Space diagonal 141413.28818396

Equilateral Triangle

Length = n
Perimeter 244935
Area 2886421978.4449
Altitude 70706.64409198

Triangular Pyramid

Length = n
Surface area 2886421978.4449
Volume 64139051306353
Height 38487.822099984