Number

98

98 is a composite number, even, a calendar year.

Deficient Number Flippable Odious Number Pernicious Number Recamán's Sequence Year

Historical context — 98 AD

Calendar year

AD 98 (XCVIII) was a common year starting on Monday of the Julian calendar.

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Historical context — 98 BC

Calendar year

Year 98 BC was a year of the pre-Julian Roman calendar.

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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, 98
Ended on: Wednesday
December 31, 98
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 90s
90–99
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,928
1928 years before 2026.

In other calendars

Hebrew: 3858 / 3859 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Dog
Sexagenary cycle position 35 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 641 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 90 / 91 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 20 / 19 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 2
Digit sum: 17
Digit product: 72
Digital root: 8
Palindrome: No
Bit width: 7 bits
Reversed: 89
Flips to (rotate 180°): 86
Recamán's sequence: a(391) = 98
Square (n²): 9,604
Cube (n³): 941,192
Divisor count: 6
σ(n) — sum of divisors: 171
φ(n) — Euler's totient: 42
Sum of prime factors: 16

Primality

Prime factorization: 2 × 7 ²

Nearest primes: 97 (−1) · 101 (+3)

Divisors & multiples

All divisors (6)

1 · 2 · 7 · 14 · 49 (half) · 98

Aliquot sum (sum of proper divisors): 73

Factor pairs (a × b = 98)

1 × 98

2 × 49

7 × 14

First multiples

98 · 196 (double) · 294 · 392 · 490 · 588 · 686 · 784 · 882 · 980

Sums & aliquot sequence

As a sum of two squares: 7² + 7²

As consecutive integers: 23 + 24 + 25 + 26 11 + 12 + … + 17

Aliquot sequence: 98 → 73 → 1 → 0 — terminates at zero

Representations

In words: ninety-eight
Ordinal: 98th
Roman numeral: XCVIII
Binary: 1100010
Octal: 142
Hexadecimal: 0x62
Base64: Yg==
One's complement: 157 (8-bit)

In other bases

ternary (3) 10122

quaternary (4) 1202

quinary (5) 343

senary (6) 242

septenary (7) 200

nonary (9) 118

undecimal (11) 8a

duodecimal (12) 82

tridecimal (13) 77

tetradecimal (14) 70

pentadecimal (15) 68

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ϟηʹ
Mayan (base 20): 𝋤·𝋲
Chinese: 九十八
Chinese (financial): 玖拾捌

In other modern scripts

Eastern Arabic ٩٨ Devanagari ९८ Bengali ৯৮ Tamil ௯௮ Thai ๙๘ Tibetan ༩༨ Khmer ៩៨ Lao ໙໘ Burmese ၉၈

Digit at this position in famous constants

π — Pi (π): Digit 98 = 0
e — Euler's number (e): Digit 98 = 4
φ — Golden ratio (φ): Digit 98 = 1
√2 — Pythagoras's (√2): Digit 98 = 5
ln 2 — Natural log of 2: Digit 98 = 6
γ — Euler-Mascheroni (γ): Digit 98 = 7

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 98, here are decompositions:

19 + 79 = 98
31 + 67 = 98
37 + 61 = 98

ASCII character

As an ASCII codepoint, 98 is b. Printable ASCII character b.

Hex color

#000062

RGB(0, 0, 98)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.98.

Address: 0.0.0.98
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.98

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