Properties of the Number 672

Six Hundred Seventy-Two

Basics

Value: 671 → 672 → 673

Parity: even

Prime: No

Previous Prime: 661

Next Prime: 673

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ⁵ × 3 × 7

Divisors: 1, 2, 3, 4, 6, 7, 8, 12, 14, 16

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010100000

Octal: 1240

Duodecimal: 480

Hexadecimal: 2a0

Square: 451584

Square Root: 25.92296279363144

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

Triangle of coefficients of polynomials u(n,x) jointly generated with A029653; see the Formula section. A208510

Generalized pentagonal numbers: m*(3·m - 1)/2, m = 0, +-1, +-2, +-3, .... A1318

Multiply-perfect numbers: n divides σ(n). A7691

Second pentagonal numbers: a(n) = n*(3·n + 1)/2. A5449

Harmonic or Ore numbers: numbers k such that the harmonic mean of the divisors of k is an integer. A1599

Coefficients in expansion of Eisenstein series E₂ (also called E₁ or G₂). A6352

3-perfect (triply perfect, tri-perfect, triperfect or sous-double) numbers: numbers such that the sum of the divisors of n is 3n. A5820

a(n) = n*(n+1)*2^n-2. A1788

Sum of positive integers in smallest positive reduced residue system modulo n. a(1) = 1 by convention. A23896

Triangle whose (i,j)-th entry is binomial(i,j)*2^i-j. A38207