Properties of the Number 87642

Eighty-Seven Thousand Six Hundred Forty-Two

Basics

Value: 87641 → 87642 → 87643

Parity: even

Prime: No

Previous Prime: 87641

Next Prime: 87643

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ⁴ × 541

Divisors: 1, 2, 3, 6, 9, 18, 27, 54, 81, 162

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101011001011010

Octal: 253132

Duodecimal: 42876

Hexadecimal: 1565a

Square: 7681120164

Square Root: 296.0439156611735

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

a(n) = 3·a(n-3) + 3·a(n-6) + a(n-9) for n>8, a(0)=0, a(1)=a(2)=1, a(3)=a(4)=2, a(5)=3, a(6)=7, a(7)=9, a(8)=11. A237988

a(n) = A306899(n)/6. A306906

Irregular table read by rows: Take a Reuleaux triangle with all diagonals drawn, as in A340639. Then T(n,k) = number of k-sided polygons in that figure for k >= 3. A340614

Sequence of squarefree n such that Q(sqrt(n)) has no element with a fully periodical continued fraction of period 1. A87642