808
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 1530
- Proper Divisor Sum (Aliquot Sum)
- 722
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 400
- Möbius Function
- 0
- Radical
- 202
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 28
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- achthundertacht· ordinal: achthundertachtste
- English
- eight hundred eight· ordinal: eight hundred eighth
- Spanish
- ochocientos ocho· ordinal: 808º
- French
- huit cent huit· ordinal: huit cent huitième
- Italian
- ottocentootto· ordinal: 808º
- Latin
- octingenti octo· ordinal: 808.
- Portuguese
- oitocentos e oito· ordinal: 808º
Appears in sequences
- Number of loops of length 4n on square grid that turn at each step and return to start in original direction.at n=6A000644
- Strobogrammatic numbers: the same upside down.at n=13A000787
- Numbers beginning with letter 'e' in English.at n=21A000873
- Number of ordered rooted trees with n edges having root of odd degree.at n=7A000958
- Numbers in which every digit contains at least one loop (version 1).at n=34A001743
- Generalized sum of divisors function.at n=24A002132
- Number of partitions of 4*n into powers of 4.at n=57A005705
- Numbers with mirror symmetry about middle.at n=8A006072
- Numbers k such that k^8 + 1 is prime.at n=31A006314
- Horizontally symmetric numbers.at n=51A007284
- Add 7, then reverse digits.at n=46A007398
- Coordination sequence T6 for Zeolite Code MFI.at n=18A008169
- Coordination sequence T1 for feldspar.at n=19A008254
- Coordination sequence T2 for feldspar.at n=19A008255
- Expansion of (1+x^7)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=37A008768
- Coordination sequence T1 for Zeolite Code -CHI.at n=18A009846
- Coordination sequence T3 for Zeolite Code -PAR.at n=20A009857
- Coordination sequence T5 for Zeolite Code CON.at n=20A009872
- Expansion of e.g.f.: exp(arcsin(x)*log(x+1)).at n=6A012304
- arctan(arctan(x)+tan(x))=2*x-16/3!*x^3+808/5!*x^5-99328/7!*x^7...at n=2A013000