765
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
- 1404
- Proper Divisor Sum (Aliquot Sum)
- 639
- 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
- 384
- Möbius Function
- 0
- Radical
- 255
- 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
- 46
- 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
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- siebenhundertfünfundsechzig· ordinal: siebenhundertfünfundsechzigste
- English
- seven hundred sixty-five· ordinal: seven hundred sixty-fifth
- Spanish
- setecientos sesenta y cinco· ordinal: 765º
- French
- sept cent soixante-cinq· ordinal: sept cent soixante-cinqième
- Italian
- settecentosessantacinque· ordinal: 765º
- Latin
- septingenti sexaginta quinque· ordinal: 765.
- Portuguese
- setecentos e sessenta e cinco· ordinal: 765º
Appears in sequences
- a(n) = 16*a(n-1) - a(n-2) with a(0) = 0, a(1) = 3.at n=3A001080
- Numbers that are the sum of 4 cubes in more than 1 way.at n=47A001245
- Expansion of 1/(1-x)^2/(1-x^2)/(1-x^4)/(1-x^10)/(1-x^20).at n=26A001307
- Pile of coconuts problem: (n-1)*(n^n - 1), n even; n^n - n + 1, n odd.at n=3A002021
- Related to partitions.at n=8A002040
- MacMahon's generalized sum of divisors function.at n=16A002127
- Octagonal pyramidal numbers: a(n) = n*(n+1)*(2*n-1)/2.at n=8A002414
- Nearest integer to 24*(2^n - 1)/n.at n=7A003138
- Integer part of 24(2^n-1)/n.at n=7A003176
- a(n) = ceiling(24(2^n-1)/n).at n=7A003177
- Numbers that are the sum of 8 positive 5th powers.at n=25A003353
- Divisors of 2^24 - 1.at n=33A003532
- Divisors of 2^48 - 1.at n=39A003553
- Number of 2n-bead black-white reversible complementable necklaces with n black beads.at n=9A006840
- Binary palindromes: numbers whose binary expansion is palindromic.at n=54A006995
- Add 2, then reverse digits!.at n=54A007396
- Numbers that are the sum of 2 nonzero squares in 2 or more ways.at n=53A007692
- Coordination sequence T1 for Zeolite Code PHI.at n=20A008227
- Coordination sequence T2 for Zeolite Code PHI.at n=20A008228
- Multiples of 15.at n=51A008597