Properties of the Number -87685

Eighty-Seven Thousand Six Hundred Eighty-Five

Basics

Value: -87686 → -87685 → -87684

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 5 × 13 × 19 × 71

Divisors: 1, 5, 13, 19, 65, 71, 95, 247, 355, 923

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10101011010000101

Octal: -253205

Duodecimal: -428B1

Hexadecimal: -15685

Square: 7688659225

Square Root: 296.1165311157079

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

Numbers n such that σ(n) = 2*φ(n). A62699

a(0) = 1 by convention; for n>0, a(n) is the number of points in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter). A331449

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal. A236789

Numbers n such that σ(n) = φ(3n). A74891

Numbers k such that k, 2·k and 4·k are balanced numbers (A020492). A76376

Difference between sum of largest parts and sum of smallest parts of all partitions of n into an even number of parts. A211881

Odd integers m such that φ(m) | σ(m). A15715

Numbers k such that gcd(σ(k), φ(k)) (A009223) attains record values. A222711

Numbers k such that σ(k) = φ(k·bigomega(k)). A68400

Number of monotonic matrices of order n. A86976