155,428
155,428 is a composite number, even.
155,428 (one hundred fifty-five thousand four hundred twenty-eight) is an even 6-digit number. It is a composite number with 36 divisors, and factors as 2² × 7² × 13 × 61. Its proper divisors sum to 190,904, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x25F24.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 25
- Digit product
- 1,600
- Digital root
- 7
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 824,551
- Recamán's sequence
- a(477,263) = 155,428
- Square (n²)
- 24,157,863,184
- Cube (n³)
- 3,754,808,358,962,752
- Divisor count
- 36
- σ(n) — sum of divisors
- 346,332
- φ(n) — Euler's totient
- 60,480
- Sum of prime factors
- 92
Primality
Prime factorization: 2 2 × 7 2 × 13 × 61
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√155,428 = [394; (4, 9, 2, 15, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 15, 2, 9, 4, 788)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifty-five thousand four hundred twenty-eight
- Ordinal
- 155428th
- Binary
- 100101111100100100
- Octal
- 457444
- Hexadecimal
- 0x25F24
- Base64
- Al8k
- One's complement
- 4,294,811,867 (32-bit)
- Scientific notation
- 1.55428 × 10⁵
- As a duration
- 155,428 s = 1 day, 19 hours, 10 minutes, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρνευκηʹ
- Mayan (base 20)
- 𝋳·𝋨·𝋫·𝋨
- Chinese
- 一十五萬五千四百二十八
- Chinese (financial)
- 壹拾伍萬伍仟肆佰貳拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 155428, here are decompositions:
- 5 + 155423 = 155428
- 29 + 155399 = 155428
- 41 + 155387 = 155428
- 47 + 155381 = 155428
- 101 + 155327 = 155428
- 137 + 155291 = 155428
- 197 + 155231 = 155428
- 227 + 155201 = 155428
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A5 BC A4 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.95.36.
- Address
- 0.2.95.36
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.95.36
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 155,428 and was likely granted around 1873.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.