Number

755

755 is a composite number, odd, a calendar year.

755 (seven hundred fifty-five) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 5 × 151. Written other ways, in Roman numerals it is DCCLV and in binary, 1011110011.

Arithmetic Number Cube-Free Deficient Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Interestingness

★ ★ ★ ☆ ☆

5 notable facts · grade C

743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767

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Historical context — 755 AD

Calendar year

Year 755 (DCCLV) was a common year starting on Wednesday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Historical context — 755 BC

Decade

This article concerns the period 759 BC – 750 BC.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

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: Saturday
January 1, 755
Ended on: Saturday
December 31, 755
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 750s
750–759
Century: 8th century
701–800
Millennium: 1st millennium
1–1000
Years ago: 1,271
1271 years before 2026.

In other calendars

Hebrew: 4515 / 4516 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 137 / 138 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Goat
Sexagenary cycle position 32 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1298 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 133 / 134 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 747 / 748 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 677 / 676 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 17
Digit product: 175
Digital root: 8
Palindrome: No
Bit width: 10 bits
Reversed: 557
Recamán's sequence: a(921) = 755
Square (n²): 570,025
Cube (n³): 430,368,875
Divisor count: 4
σ(n) — sum of divisors: 912
φ(n) — Euler's totient: 600
Sum of prime factors: 156

Primality

Prime factorization: 5 × 151

Nearest primes: 751 (−4) · 757 (+2)

Divisors & multiples

All divisors (4)

1 · 5 · 151 · 755

Aliquot sum (sum of proper divisors): 157

Factor pairs (a × b = 755)

1 × 755

5 × 151

First multiples

755 · 1,510 (double) · 2,265 · 3,020 · 3,775 · 4,530 · 5,285 · 6,040 · 6,795 · 7,550

Sums & aliquot sequence

As consecutive integers: 377 + 378 149 + 150 + 151 + 152 + 153 71 + 72 + … + 80

Aliquot sequence: 755 → 157 → 1 → 0 — terminates at zero

Continued fraction of √n

√755 = [27; (2, 10, 2, 54)]

Period length 4 — the block in parentheses repeats forever.

Representations

In words: seven hundred fifty-five
Ordinal: 755th
Roman numeral: DCCLV
Binary: 1011110011
Octal: 1363
Hexadecimal: 0x2F3
Base64: AvM=
One's complement: 64,780 (16-bit)
Scientific notation: 7.55 × 10²
As a duration: 755 s = 12 minutes, 35 seconds

In other bases

ternary (3) 1000222

quaternary (4) 23303

quinary (5) 11010

senary (6) 3255

septenary (7) 2126

nonary (9) 1028

undecimal (11) 627

duodecimal (12) 52b

tridecimal (13) 461

tetradecimal (14) 3bd

pentadecimal (15) 355

As an angle

755° = 2 × 360° + 35°

35° ≈ 0.611 rad

Compass bearing: NE (northeast)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ψνεʹ
Mayan (base 20): 𝋡·𝋱·𝋯
Chinese: 七百五十五
Chinese (financial): 柒佰伍拾伍

In other modern scripts

Eastern Arabic ٧٥٥ Devanagari ७५५ Bengali ৭৫৫ Tamil ௭௫௫ Thai ๗๕๕ Tibetan ༧༥༥ Khmer ៧៥៥ Lao ໗໕໕ Burmese ၇၅၅

Digit at this position in famous constants

π — Pi (π): Digit 755 = 7
e — Euler's number (e): Digit 755 = 2
φ — Golden ratio (φ): Digit 755 = 4
√2 — Pythagoras's (√2): Digit 755 = 1
ln 2 — Natural log of 2: Digit 755 = 9
γ — Euler-Mascheroni (γ): Digit 755 = 3

Also seen as

Unicode codepoint

Modifier Letter Low Ring

U+02F3

Modifier symbol (Sk)

UTF-8 encoding: CB B3 (2 bytes).

Lookup U+02F3 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0002F3

RGB(0, 2, 243)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.243.

Address: 0.0.2.243
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.243

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Musical pitch

Heard as a frequency, 755 Hz is closest to:

Concert pitch (A4 = 440 Hz): F♯5 (740 Hz, +35¢)
Scientific pitch (C4 = 256 Hz): G5 (767.1 Hz, -28¢)
Baroque pitch (A4 = 415 Hz): G5 (739.4 Hz, +36¢)