Properties of the Number 70

Seventy

Basics

Value: 69 → 70 → 71

Parity: even

Prime: No

Previous Prime: 67

Next Prime: 71

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 7

Divisors: 1, 2, 5, 7, 10, 14, 35, 70

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1000110

Octal: 106

Duodecimal: 5A

Hexadecimal: 46

Square: 4900

Square Root: 8.366600265340756

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) is the number of distinct reduced words of length n in the Coxeter group of "Apollonian reflections" in three dimensions. A154638

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

Pascal's triangle read by rows: C(n,k) = binomial(n,k) = n!/(k!*(n-k)!), 0 <= k <= n. A7318

Squarefree numbers: numbers that are not divisible by a square greater than 1. A5117

Largest squarefree number dividing n: the squarefree kernel of n, rad(n), radical of n. A7947

Central binomial coefficients: binomial(2·n,n) = (2·n)!/(n!)². A984

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

The nonnegative integers. A1477

Pell numbers: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2·a(n-1) + a(n-2). A129

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

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