730
730 is a composite number, even, a calendar year.
730 (seven hundred thirty) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2 × 5 × 73. Written other ways, in Roman numerals it is DCCXXX and in binary, 1011011010.
Interestingness
Historical context — 730 AD
Calendar year
Year 730 (DCCXXX) was a common year starting on Sunday of the Julian calendar.
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Historical context — 730 BC
Decade
This article concerns the period 739 BC – 730 BC.
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Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
- 52
- Started on
-
Wednesday
January 1, 730
- Ended on
-
Wednesday
December 31, 730
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
730s
730–739
- Century
-
8th century
701–800
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,296
1296 years before 2026.
In other calendars
- Hebrew
-
4490 / 4491 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
111 / 112 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Horse
Sexagenary cycle position 7 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1273 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
108 / 109 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
722 / 723 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
652 / 651 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 5 × 73
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√730 = [27; (54)]
Period length 1 — the block in parentheses repeats forever.
Representations
- In words
- seven hundred thirty
- Ordinal
- 730th
- Roman numeral
- DCCXXX
- Binary
- 1011011010
- Octal
- 1332
- Hexadecimal
- 0x2DA
- Base64
- Ato=
- One's complement
- 64,805 (16-bit)
- Scientific notation
- 7.3 × 10²
- As a duration
- 730 s = 12 minutes, 10 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹 𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆
- Greek (Milesian)
- ψλʹ
- Mayan (base 20)
- 𝋡·𝋰·𝋪
- Chinese
- 七百三十
- Chinese (financial)
- 柒佰參拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 730 = 8
- e — Euler's number (e)
- Digit 730 = 9
- φ — Golden ratio (φ)
- Digit 730 = 6
- √2 — Pythagoras's (√2)
- Digit 730 = 1
- ln 2 — Natural log of 2
- Digit 730 = 7
- γ — Euler-Mascheroni (γ)
- Digit 730 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 730, here are decompositions:
- 3 + 727 = 730
- 11 + 719 = 730
- 29 + 701 = 730
- 47 + 683 = 730
- 53 + 677 = 730
- 71 + 659 = 730
- 83 + 647 = 730
- 89 + 641 = 730
Showing the first eight; more decompositions exist.
UTF-8 encoding: CB 9A (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.218.
- Address
- 0.0.2.218
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.2.218
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 730 is an active NANP area code (North American Numbering Plan).
- Primary area
- Southern Illinois
- Region
- Illinois
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Heard as a frequency, 730 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F♯5 (740 Hz, -24¢)
- Scientific pitch (C4 = 256 Hz): F♯5 (724.1 Hz, +14¢)
- Baroque pitch (A4 = 415 Hz): G5 (739.4 Hz, -22¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.