86
domain: N
Properties
Digital Properties
- Digit Count
- 2
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 132
- Proper Divisor Sum (Aliquot Sum)
- 46
- 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
- 42
- Möbius Function
- 1
- Radical
- 86
- Omega Function (Ω)
- 2
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 30
- Smith Number
- no
Classification
- Natural
- yes
- Even
- yes
- Odd
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- 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
Names
- German
- sechsundachtzig· ordinal: sechsundachtzigste
- English
- eighty-six· ordinal: eighty-sixth
- Spanish
- ochenta y seis· ordinal: 86º
- French
- quatre-vingt-six· ordinal: quatre-vingt-sixième
- Italian
- ottantasei· ordinal: 86º
- Latin
- octoginta sex· ordinal: 86.
- Portuguese
- oitenta e seis· ordinal: 86º
Appears in sequences
- Number of centered hydrocarbons with n atoms.at n=11A000022
- Numbers that are not squares (or, the nonsquares).at n=76A000037
- 1-digit numbers arranged in alphabetical order, then the 2-digit numbers arranged in alphabetical order, then the 3-digit numbers, etc.at n=18A000052
- Local stops on New York City 1 Train (Broadway-7 Avenue Local) subway.at n=11A000053
- Local stops on New York City A line subway.at n=9A000054
- A Beatty sequence: a(n) = floor(n/(e-2)).at n=61A000062
- a(8i+j) = 13i + a(j), where 1<=j<=8.at n=52A000202
- Number of plane partitions (or planar partitions) of n.at n=7A000219
- 3*n - 2*floor(sqrt(4*n+5)) + 5.at n=35A000277
- Numbers where total number of 1-bits in the exponents of their prime factorization is even; a 2-way classification of integers: complement of A000028.at n=44A000379
- Numbers that are the sum of three nonzero squares.at n=55A000408
- Numbers that are the sum of 3 but no fewer nonzero squares.at n=35A000419
- The greedy sequence of integers which avoids 3-term geometric progressions.at n=63A000452
- 1 together with products of 2 or more distinct primes.at n=30A000469
- Number of Hamiltonian paths from NW to SW corners in an n X n grid.at n=4A000532
- Number of nonnegative solutions of x^2 + y^2 = z in first n shells.at n=42A000592
- One half of number of non-self-conjugate partitions; also half of number of asymmetric Ferrers graphs with n nodes.at n=15A000701
- Numbers beginning with a vowel in English.at n=10A000852
- Numbers beginning with letter 'e' in English.at n=9A000873
- Dimension of the n-th graded piece of the mod-2 Steenrod algebra A_2.at n=41A000929