Properties of the Number 765

Seven Hundred Sixty-Five

Basics

Value: 764 → 765 → 766

Parity: odd

Prime: No

Previous Prime: 761

Next Prime: 769

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 17

Divisors: 1, 3, 5, 9, 15, 17, 45, 51, 85, 153

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1011111101

Octal: 1375

Duodecimal: 539

Hexadecimal: 2fd

Square: 585225

Square Root: 27.65863337187866

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Binary palindromes: numbers whose binary expansion is palindromic. A6995

Let T_n be the infinite sequence formed by starting with 1 and repeatedly reversing the digits and adding n to get the next term. If T_n eventually reaches a cycle, sequence gives length of that cycle, otherwise -1. A117817

Exponential Riordan array [1, 1/(2-e^x)-1]. A256893

Octagonal pyramidal numbers: a(n) = n*(n+1)*(2·n-1)/2. A2414

Number of sets (in the Hausdorff metric geometry) at each location between two sets defining a polygonal configuration consisting of two m-gonal polygonal components chained with string components of length 1 as m varies. A152928

Numbers that are the sum of 8 positive 5th powers. A3353

The non-repetitive Kaprekar binary numbers in decimal. A163205

5 times triangular numbers: a(n) = 5·n*(n+1)/2. A28895

G.f.: (x+2)*(x+1)/((x-1)*(x-2)) = ∑_n>=0 a(n)*(x/2)ⁿ. A68156

Numbers whose sum of digits is 18. A235228