675
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 1240
- Proper Divisor Sum (Aliquot Sum)
- 565
- 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
- 360
- Möbius Function
- 0
- Radical
- 15
- Omega Function (Ω)
- 5
- 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
- 113
- 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
- yes
- Perfect Power
- no
- Smooth Number
- yes
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- sechshundertfünfundsiebzig· ordinal: sechshundertfünfundsiebzigste
- English
- six hundred seventy-five· ordinal: six hundred seventy-fifth
- Spanish
- seiscientos setenta y cinco· ordinal: 675º
- French
- six cent soixante-quinze· ordinal: six cent soixante-quinzième
- Italian
- seicentosettantacinque· ordinal: 675º
- Latin
- sescenti septuaginta quinque· ordinal: 675.
- Portuguese
- seiscentos e setenta e cinco· ordinal: 675º
Appears in sequences
- a(n) = floor(n^2/3).at n=45A000212
- Sums of ménage numbers.at n=7A000271
- a(n) = 4*n^2 - 1.at n=13A000466
- Number of primes < prime(n)^2.at n=19A000879
- Number of cells of square lattice of edge 1/n inside quadrant of unit circle centered at 0.at n=29A001182
- Number of fixed 2-dimensional triangular-celled animals with n cells (n-iamonds, polyiamonds) in the 2-dimensional hexagonal lattice.at n=7A001420
- a(n) = (4*n+1)*(4*n+3).at n=6A001539
- 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=42A001694
- Number of permutations of length n within distance 3 of a fixed permutation.at n=7A002526
- a(n) = n^2 written backwards.at n=23A002942
- Numbers that are the sum of 5 positive 4th powers.at n=43A003339
- Numbers that are the sum of 6 positive 4th powers.at n=52A003340
- Numbers of the form 3^i*5^j with i, j >= 0.at n=17A003593
- Number of primes <= n!.at n=7A003604
- a(n) = n*(n + 1)*(n^2 - 3*n + 6)/8.at n=8A004255
- Denominator of 2^n*(3*n-3)!/( ((n-1)!)^3 * (2*n)! ).at n=6A004824
- a(n) = n*(n+2) = (n+1)^2 - 1.at n=25A005563
- Numbers k such that the standard deviation of 1,...,k is an integer.at n=3A007654
- Coordination sequence T1 for Zeolite Code APC.at n=18A008032
- Coordination sequence T1 for Zeolite Code FER.at n=16A008106