2650
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 5022
- Proper Divisor Sum (Aliquot Sum)
- 2372
- 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
- 1040
- Möbius Function
- 0
- Radical
- 530
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 27
- Smith Number
- no
- Vampire 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
Appears in sequences
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=25A000443
- a(n) = sigma_2(n): sum of squares of divisors of n.at n=45A001157
- 7th-order maximal independent sets in cycle graph.at n=52A007389
- Coordination sequence T3 for Zeolite Code GOO.at n=35A008113
- Coordination sequence T1 for Zeolite Code STI.at n=35A008234
- Coordination sequence for MgNi2, Position Ni1.at n=13A009933
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=23A025286
- Numbers that are the sum of 2 nonzero squares in 3 or more ways.at n=30A025294
- Numbers that are the sum of 2 distinct nonzero squares in exactly 3 ways.at n=22A025304
- Numbers that are the sum of 2 distinct nonzero squares in 3 or more ways.at n=29A025313
- Expansion of 1/((1-3x)(1-4x)(1-6x)(1-7x)).at n=3A028032
- a(n) = n*(n+3).at n=50A028552
- Every run of digits of n in base 4 has length 2.at n=25A033002
- Both primitively and imprimitively represented by x^2+y^2.at n=36A034025
- Sum of squares of unitary divisors of n.at n=45A034676
- Dirichlet convolution of Fibonacci numbers with phi(n).at n=17A034748
- Numbers n such that BCR(n) = n, where BCR = binary-complement-and-reverse = take one's complement then reverse bit order.at n=40A035928
- Numerators of continued fraction convergents to sqrt(422).at n=6A041802
- Base-4 palindromes that start with 2.at n=35A043004
- a(n)=(s(n)+3)/8, where s(n)=n-th base 8 palindrome that starts with 5.at n=29A043069