7625
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 9672
- Proper Divisor Sum (Aliquot Sum)
- 2047
- 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
- 6000
- Möbius Function
- 0
- Radical
- 305
- 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
- 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
- 83
- 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
- no
- Odd
- yes
Appears in sequences
- Discriminants of totally real quartic fields (see comments).at n=27A002769
- Number of points on surface of tricapped prism: a(n) = 7*n^2 + 2 for n > 0, a(0)=1.at n=33A005919
- a(n) = a(n-2) + a(n-3), with a(0) = 0, a(1) = 1, a(2) = 4.at n=31A007309
- Numbers k such that k^2 and k have same last 3 digits.at n=31A008853
- Numbers n such that n is a substring of its square when both are written in base 2.at n=47A018826
- Numbers n such that n is a substring of its square (both n and n squared in base 4) (written in base 10).at n=22A018828
- Discriminants of totally real quartic fields.at n=35A023680
- Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 2 (mod 4).at n=43A035547
- Numbers that are divisible by 5 and are the difference between two (different positive) cubes in at least one way.at n=33A038853
- Numbers ending with '5' that are the difference of two positive cubes.at n=23A038860
- a(n) = (n+5)^3 - n^3.at n=20A038867
- a(n) = (L(n) + L(2*n))/2, where L = A000032 (the Lucas sequence).at n=10A049680
- a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1 and a(2) = a(3) = 3.at n=14A049925
- If B is a collection in which there are C(n-1) [Catalan numbers, A000108] things with n points, a(n) is the number of subsets without repetition of B with a total of n points.at n=10A052805
- If p | n, then p+1 | n+1 for composite n.at n=38A056729
- Numbers k such that the product of the first k composite numbers minus 1 is a prime.at n=22A057017
- Numbers n such that n | 7^n + 6^n + 5^n + 4^n + 3^n.at n=10A057255
- Numbers k such that k | 6^k + 5^k + 4^k + 3^k + 2^k.at n=23A057256
- Numbers k such that sigma(k) divides sigma(phi(k)).at n=31A066831
- Numbers n such that sigma(phi(n))/sigma(n) = 2.at n=21A067382