Properties of the Number 128

One Hundred Twenty-Eight

Basics

Value: 127 → 128 → 129

Parity: even

Prime: No

Previous Prime: 127

Next Prime: 131

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ⁷

Divisors: 1, 2, 4, 8, 16, 32, 64, 128

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000000

Octal: 200

Duodecimal: A8

Hexadecimal: 80

Square: 16384

Square Root: 11.313708498984761

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: Yes

Fermat Number: No

Cullen Number: No

OEIS Sequences

Powers of 2: a(n) = 2ⁿ. A79

Powers of primes. Alternatively, 1 and the prime powers (p^k, p prime, k >= 1). A961

Coefficients of expansion of (1-x)/(1-2·x) in powers of x. A11782

Perfect powers: m^k where m > 0 and k >= 2. A1597

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

Numbers that are not squarefree. Numbers that are divisible by a square greater than 1. The complement of A005117. A13929

Powerful numbers, definition (1): if a prime p divides n then p² must also divide n (also called squareful, square full, square-full or 2-powerful numbers). A1694

Prime powers: numbers of the form p^k where p is a prime and k >= 1. A246655

Unary-encoded compressed factorization of natural numbers. A156552

3-smooth numbers: numbers of the form 2ⁱ*3^j with i, j >= 0. A3586

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