128,742
128,742 is a composite number, even.
128,742 (one hundred twenty-eight thousand seven hundred forty-two) is an even 6-digit number. It is a composite number with 16 divisors, and factors as 2 × 3 × 43 × 499. Its proper divisors sum to 135,258, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F6E6.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 24
- Digit product
- 896
- Digital root
- 6
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 247,821
- Recamán's sequence
- a(232,156) = 128,742
- Square (n²)
- 16,574,502,564
- Cube (n³)
- 2,133,834,609,094,488
- Divisor count
- 16
- σ(n) — sum of divisors
- 264,000
- φ(n) — Euler's totient
- 41,832
- Sum of prime factors
- 547
Primality
Prime factorization: 2 × 3 × 43 × 499
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√128,742 = [358; (1, 4, 6, 10, 1, 1, 4, 1, 1, 3, 3, 2, 9, 1, 2, 16, 2, 1, 9, 2, 3, 3, 1, 1, …)]
Period length 32 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-eight thousand seven hundred forty-two
- Ordinal
- 128742nd
- Binary
- 11111011011100110
- Octal
- 373346
- Hexadecimal
- 0x1F6E6
- Base64
- Afbm
- One's complement
- 4,294,838,553 (32-bit)
- Scientific notation
- 1.28742 × 10⁵
- As a duration
- 128,742 s = 1 day, 11 hours, 45 minutes, 42 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ρκηψμβʹ
- Mayan (base 20)
- 𝋰·𝋡·𝋱·𝋢
- Chinese
- 一十二萬八千七百四十二
- Chinese (financial)
- 壹拾貳萬捌仟柒佰肆拾貳
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 128742, here are decompositions:
- 59 + 128683 = 128742
- 73 + 128669 = 128742
- 79 + 128663 = 128742
- 83 + 128659 = 128742
- 113 + 128629 = 128742
- 139 + 128603 = 128742
- 151 + 128591 = 128742
- 179 + 128563 = 128742
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 9F 9B A6 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.1.246.230.
- Address
- 0.1.246.230
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.246.230
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 128,742 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 128742 first appears in π at position 655,166 of the decimal expansion (the 655,166ordinal-suffix:th 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°.