Properties of the Number 678

Six Hundred Seventy-Eight

Basics

Value: 677 → 678 → 679

Parity: even

Prime: No

Previous Prime: 677

Next Prime: 683

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 113

Divisors: 1, 2, 3, 6, 113, 226, 339, 678

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010100110

Octal: 1246

Duodecimal: 486

Hexadecimal: 2a6

Square: 459684

Square Root: 26.038433132583073

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

Number of separable partitions of n; see Comments. A325534

Number of points on surface of octahedron; also coordination sequence for cubic lattice: a(0) = 1; for n > 0, a(n) = 4n² + 2. A5899

a(n) = n² + 2. A59100

Primitive abundant numbers: abundant numbers (A005101) having no abundant proper divisor. A91191

Number of compositions of n such that each part is adjacent to an equal part. A114901

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

Admirable numbers. A number n is admirable if there exists a proper divisor d' of n such that σ(n)-2d'=2n, where σ(n) is the sum of all divisors of n. A111592

Unitary abundant numbers: numbers k such that usigma(k) > 2·k. A34683

a(0)=1; for n>0, a(n) = 2·5^n-1 - (1/2)*∑_i=1..n-1 a(i)*a(n-i). A85362

Multiples of 6 containing a 6 in their decimal representation. A121026