128,988
128,988 is a composite number, even.
128,988 (one hundred twenty-eight thousand nine hundred eighty-eight) is an even 6-digit number. It is a composite number with 18 divisors, and factors as 2² × 3² × 3,583. Its proper divisors sum to 197,156, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F7DC.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 36
- Digit product
- 9,216
- Digital root
- 9
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 889,821
- Recamán's sequence
- a(231,664) = 128,988
- Square (n²)
- 16,637,904,144
- Cube (n³)
- 2,146,089,979,726,272
- Divisor count
- 18
- σ(n) — sum of divisors
- 326,144
- φ(n) — Euler's totient
- 42,984
- Sum of prime factors
- 3,593
Primality
Prime factorization: 2 2 × 3 2 × 3583
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√128,988 = [359; (6, 1, 2, 2, 7, 2, 1, 1, 1, 1, 1, 1, 2, 3, 1, 1, 2, 2, 1, 1, 4, 7, 5, 2, …)]
Representations
- In words
- one hundred twenty-eight thousand nine hundred eighty-eight
- Ordinal
- 128988th
- Binary
- 11111011111011100
- Octal
- 373734
- Hexadecimal
- 0x1F7DC
- Base64
- Affc
- One's complement
- 4,294,838,307 (32-bit)
- Scientific notation
- 1.28988 × 10⁵
- As a duration
- 128,988 s = 1 day, 11 hours, 49 minutes, 48 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρκηϡπηʹ
- Mayan (base 20)
- 𝋰·𝋢·𝋩·𝋨
- Chinese
- 一十二萬八千九百八十八
- Chinese (financial)
- 壹拾貳萬捌仟玖佰捌拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 128988, here are decompositions:
- 5 + 128983 = 128988
- 7 + 128981 = 128988
- 17 + 128971 = 128988
- 19 + 128969 = 128988
- 29 + 128959 = 128988
- 37 + 128951 = 128988
- 47 + 128941 = 128988
- 109 + 128879 = 128988
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.1.247.220.
- Address
- 0.1.247.220
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.247.220
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 128,988 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 128988 first appears in π at position 553,241 of the decimal expansion (the 553,241ordinal-suffix:st digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.