Max	9223372036854775807
25835	Positive integer
0b10001100	Binary number
01771452	Octal number
0x129abf	Hex number
5.012 * 10^7	Scientific notation
2^4 * 5	Factorized form
*	Random number

81987 (number)

81987 is an odd 5-digits composite number following 81986 and preceding 81988. In scientific notation, it is written as 8.1987 × 10^4. The sum of its digits is 33. It has a total of 2 prime factors and 4 positive divisors. There are 54656 positive integers (up to 81987) that are relatively prime to 81987.

Interesting facts

81987 has 4 divisors, whose sum is 109320
The reverse of 81987 is 78918
Previous prime number is 3

Basic properties

Is Prime? no
Number parity odd
Number length 5
Sum of Digits 33
Digital Root 6

Name

Name	eighty-one thousand nine hundred eighty-seven

Notation

Scientific notation	8.1987 × 10^4
Engineering notation	8.1987 × 10^3

Prime Factorization of 81987

Prime Factorization 3 × 27329

Composite number

ω	Distinct Factors	2	Total number of distinct prime factors
Ω	Total Factors	2	Total number of prime factors
rad	Radical	81987	Product of the distinct prime numbers

The prime factorization of 81987 is 3 × 27329. Since it has a total of 2 prime factors.

Most popular turbo-numbers

6, 7, 75, 67, 912, 342, 4792, 1313, 10511, 27809, 244150, 322632, 9391449, 2882759, 42554929, 92901518, 951280809, 931425135, 8285536391, 1192963695

Basic calculations (n = 81987)

Multiplication

n×y

n×2	163974
n×3	245961
n×4	327948
n×5	409935

Division

n÷y

n÷2	40993.5
n÷3	27329
n÷3	20496.75
n÷5	16397.4

Exponentiation

n^y

n²	6721868169
n³	551105805571803
n⁴	4.5183511681415E+19
n⁵	3.7044605722242E+24

Nth Root

^y√n

²√n	286.33372138119
³√n	43.442518872149
⁴√n	16.921398328188
⁵√n	9.6105667418243

Divisors of 81987

1, 3, 27329, 81987

4 divisors

τ	Total Divisors	4	Total number of the positive divisors of n
σ	Sum of Divisors	1	Sum of all the positive divisors of n
s	Aliquot Sum	-81986	Sum of the proper positive divisors of n
A	Arithmetic Mean	0.25	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	4	Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81987 can be divided by 4 positive divisors. The sum of these divisors (counting 81987) is 1, the average is 0.25.

Base conversion 81987

Base	System	Value
2	Binary	10100000001000011
3	Ternary	11011110120
4	Quaternary	110001003
5	Quinary	10110422
6	Senary	1431323
8	Octal	240103
10	Decimal	81987
12	Duodecimal	3b543
16	Hexadecimal	14043
20	Vigesimal	a4j7
36	Base36	1r9f

Cryptographic Hash Functions

md5	053b800a27404b77a2068da3169e36dd
sha1	e01835b7e70d5b7e23e20012146328f86d81aef9
sha256	846ec8d41b162c6434d8c0b3d10b8fb1a0715ed17a155db60b03cf235d133166
sha512	b66f8dc7b6fc9161190d8f69e63bb4083038660d319823e91ab69a185cb802741e4adfb17beb8a65eb8ead77b50ef93d41e010ffe35695782a90b21962857aa4
ripemd-160	6a3d3e7f2701199578e6236f4264fbe9d610d111

81987 as geometric shapes

Circle

Radius = n

Diameter	163974
Circumference	515139.51377973
Area	21117371658.129

Sphere

Radius = n

Volume	2.3084666001801E+15
Surface area	84469486632.518
Circumference	515139.51377973

Square

Length = n

Perimeter	327948
Area	6721868169
Diagonal	115947.12733828

Cube

Length = n

Surface area	40331209014
Volume	551105805571803
Space diagonal	142005.64956015

Equilateral Triangle

Length = n

Perimeter	245961
Area	2910654297.622
Altitude	71002.824780075

Triangular Pyramid

Length = n

Surface area	2910654297.622
Volume	64948442045183
Height	38649.042446094