676
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 9
- Divisor Sum
- 1281
- Proper Divisor Sum (Aliquot Sum)
- 605
- 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
- 312
- Möbius Function
- 0
- Radical
- 26
- 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
- yes
- 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
- 51
- 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
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- sechshundertsechsundsiebzig· ordinal: sechshundertsechsundsiebzigste
- English
- six hundred seventy-six· ordinal: six hundred seventy-sixth
- Spanish
- seiscientos setenta y seis· ordinal: 676º
- French
- six cent soixante-seize· ordinal: six cent soixante-seizième
- Italian
- seicentosettantasei· ordinal: 676º
- Latin
- sescenti septuaginta sex· ordinal: 676.
- Portuguese
- seiscentos e setenta e seis· ordinal: 676º
Appears in sequences
- Number of rooted polyhedral graphs with n edges.at n=7A000287
- n followed by n^2.at n=51A000463
- Numbers n such that the sum of the squares of n consecutive positive odd numbers x^2 + (x+2)^2 + ... + (x+2n-2)^2 = k^2 for some integer k. The least values of x and k for each n are in A056131 and A056132, respectively.at n=43A001033
- Perfect powers: m^k where m > 0 and k >= 2.at n=34A001597
- Powerful numbers, definition (1): if a prime p divides n then p^2 must also divide n (also called squareful, square full, square-full or 2-powerful numbers).at n=43A001694
- Number of partitions of 3n into n parts from the set {0, 1, ..., 6} (repetitions admissible).at n=12A001977
- Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n^2/4).at n=52A002620
- Squares and cubes.at n=32A002760
- Palindromic squares.at n=6A002779
- a(n) = n^2 written backwards.at n=25A002942
- Smallest number such that n-th iterate of Chowla function is 0.at n=13A002954
- Coefficients in expansion of permanent of infinite tridiagonal matrix shown below.at n=41A003113
- Numbers that are the sum of 6 positive 4th powers.at n=53A003340
- a(0) = 0; for n > 0, a(n) = (a(n-1) + 1)^2.at n=4A004019
- Expansion of x*(1+x^2+x^4)/((1-x)*(1-x^2)*(1-x^3)).at n=52A004652
- Triangular numbers together with squares (excluding 0).at n=59A005214
- Truncated tetrahedral numbers: a(n) = (1/6)*(n+1)*(23*n^2 + 19*n + 6).at n=5A005906
- a(n) = Sum_{k=1..n-1} k XOR n-k.at n=27A006582
- Number of n-celled polygons with perimeter 2n on square lattice.at n=4A006726
- Erroneous version of A048798.at n=25A007914