127,720
127,720 is a composite number, even.
127,720 (one hundred twenty-seven thousand seven hundred twenty) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2³ × 5 × 31 × 103. Its proper divisors sum to 171,800, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F2E8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 19
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 27,721
- Recamán's sequence
- a(497,927) = 127,720
- Square (n²)
- 16,312,398,400
- Cube (n³)
- 2,083,419,523,648,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 299,520
- φ(n) — Euler's totient
- 48,960
- Sum of prime factors
- 145
Primality
Prime factorization: 2 3 × 5 × 31 × 103
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√127,720 = [357; (2, 1, 1, 1, 2, 1, 29, 17, 2, 1, 1, 78, 1, 4, 1, 1, 4, 5, 3, 8, 1, 1, 22, 1, …)]
Period length 46 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-seven thousand seven hundred twenty
- Ordinal
- 127720th
- Binary
- 11111001011101000
- Octal
- 371350
- Hexadecimal
- 0x1F2E8
- Base64
- AfLo
- One's complement
- 4,294,839,575 (32-bit)
- Scientific notation
- 1.2772 × 10⁵
- As a duration
- 127,720 s = 1 day, 11 hours, 28 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρκζψκʹ
- Mayan (base 20)
- 𝋯·𝋳·𝋦·𝋠
- Chinese
- 一十二萬七千七百二十
- Chinese (financial)
- 壹拾貳萬柒仟柒佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 127720, here are decompositions:
- 3 + 127717 = 127720
- 11 + 127709 = 127720
- 17 + 127703 = 127720
- 29 + 127691 = 127720
- 41 + 127679 = 127720
- 71 + 127649 = 127720
- 83 + 127637 = 127720
- 113 + 127607 = 127720
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.1.242.232.
- Address
- 0.1.242.232
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.242.232
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 127,720 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.