Properties of the Number 72

Seventy-Two

Basics

Value: 71 → 72 → 73

Parity: even

Prime: No

Previous Prime: 71

Next Prime: 73

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ²

Divisors: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1001000

Octal: 110

Duodecimal: 60

Hexadecimal: 48

Square: 5184

Square Root: 8.48528137423857

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Coordination sequence for planar net 3.3.3.3.6 (also called the fsz net). A250120

a(n) = σ(n), the sum of the divisors of n. Also called sigma₁(n). A203

The positive integers. Also called the natural numbers, the whole numbers or the counting numbers, but these terms are ambiguous. A27

Expansion of ∏_k>=0 (1 + x^2k+1); number of partitions of n into distinct odd parts; number of self-conjugate partitions; number of symmetric Ferrers graphs with n nodes. A700

a(n) = n' = arithmetic derivative of n: a(0) = a(1) = 0, a(prime) = 1, a(m·n) = m·a(n) + n·a(m). A3415

The composite numbers: numbers n of the form x·y for x > 1 and y > 1. A2808

The nonnegative integers. A1477

Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378

The nonnegative even numbers: a(n) = 2n. A5843

Least integer of each prime signature A124832; also products of primorial numbers A002110. A25487

We use cookies

Some cookies are essential for Natory to function, like keeping you signed in. We also use optional cookies to understand how the app is used and improve it over time. Learn more in our Privacy Policy. You can manage your preferences anytime.