679
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 784
- Proper Divisor Sum (Aliquot Sum)
- 105
- 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
- 576
- Möbius Function
- 1
- Radical
- 679
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 64
- Smith Number
- 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
Classification
- Even
- no
- Odd
- yes
Names
- German
- sechshundertneunundsiebzig· ordinal: sechshundertneunundsiebzigste
- English
- six hundred seventy-nine· ordinal: six hundred seventy-ninth
- Spanish
- seiscientos setenta y nueve· ordinal: 679º
- French
- six cent soixante-dix-neuf· ordinal: six cent soixante-dix-neufième
- Italian
- seicentosettantanove· ordinal: 679º
- Latin
- sescenti septuaginta novem· ordinal: 679.
- Portuguese
- seiscentos e setenta e nove· ordinal: 679º
Appears in sequences
- Numbers k such that (1,k) is "good".at n=17A000696
- Number of partitions of n into nonprime parts.at n=37A002095
- Smallest number of multiplicative persistence n.at n=5A003001
- Schur's 1926 partition theorem: number of partitions of n into parts 6n+1 or 6n-1.at n=55A003105
- Numbers that are the sum of 9 positive 5th powers.at n=25A003354
- Divisors of 2^48 - 1.at n=37A003553
- Odd numbers that are not of the form x^2 + y^2 + 10*z^2.at n=16A003585
- Sum of digits of n-th term in Look and Say sequence A005150.at n=20A004977
- Sequence and first differences (A030124) together list all positive numbers exactly once.at n=32A005228
- Numbers whose sum of divisors is a square.at n=31A006532
- Stella octangula numbers: a(n) = n*(2*n^2 - 1).at n=7A007588
- Coordination sequence T2 for Zeolite Code AFO.at n=17A008016
- Coordination sequence T2 for Zeolite Code APC.at n=18A008033
- Coordination sequence T1 for Zeolite Code BRE.at n=17A008058
- Coordination sequence T2 for Zeolite Code MTW.at n=17A008197
- Coordination sequence T5 for Zeolite Code MTW.at n=17A008200
- Expansion of e.g.f.: exp(tanh(x)).x.at n=7A009263
- Numbers k such that the geometric mean of phi(k) and sigma(k) is an integer.at n=14A011257
- Smallest number of persistence n over product-of-nonzero-digits function.at n=5A014120
- Convolution of primes with themselves.at n=8A014342