491,720
491,720 is a composite number, even.
491,720 (four hundred ninety-one thousand seven hundred twenty) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2³ × 5 × 19 × 647. Its proper divisors sum to 674,680, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x780C8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 0
- Digital root
- 5
- Palindrome
- No
- Bit width
- 19 bits
- Reversed
- 27,194
- Square (n²)
- 241,788,558,400
- Cube (n³)
- 118,892,269,936,448,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 1,166,400
- φ(n) — Euler's totient
- 186,048
- Sum of prime factors
- 677
Primality
Prime factorization: 2 3 × 5 × 19 × 647
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√491,720 = [701; (4, 2, 1, 1, 8, 1, 2, 3, 2, 1, 8, 1, 1, 2, 4, 1402)]
Period length 16 — the block in parentheses repeats forever.
Representations
- In words
- four hundred ninety-one thousand seven hundred twenty
- Ordinal
- 491720th
- Binary
- 1111000000011001000
- Octal
- 1700310
- Hexadecimal
- 0x780C8
- Base64
- B4DI
- One's complement
- 4,294,475,575 (32-bit)
- Scientific notation
- 4.9172 × 10⁵
- As a duration
- 491,720 s = 5 days, 16 hours, 35 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵υϟαψκʹ
- Chinese
- 四十九萬一千七百二十
- Chinese (financial)
- 肆拾玖萬壹仟柒佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 491720, here are decompositions:
- 13 + 491707 = 491720
- 43 + 491677 = 491720
- 67 + 491653 = 491720
- 109 + 491611 = 491720
- 127 + 491593 = 491720
- 139 + 491581 = 491720
- 181 + 491539 = 491720
- 193 + 491527 = 491720
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.7.128.200.
- Address
- 0.7.128.200
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.7.128.200
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 491,720 and was likely granted around 1893.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 491720 first appears in π at position 920,961 of the decimal expansion (the 920,961ordinal-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°.