625
Alloy 625 is a nickel superalloy.
Where 625 fits
Why 625 is special
It keeps its strength where steel has softened, which is why it appears in exhaust sections, chemical plant and seawater systems at once.
625 is part of
Factors & digit properties
- Divisors (5)
- 1, 5, 25, 125, 625
- Prime factorisation
- 5^4
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 625
- Scientific notation
- 6.250 × 10^2
Roman numerals
D C X X V
Binary
1 0 0 1 1 1 0 0 0 1
1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 625
Octal
1 1 6 1
1 × 512 + 1 × 64 + 6 × 8 + 1 × 1 = 625
Hexadecimal
2 7 1
2 × 256 + 7 × 16 + 1 × 1 = 625
Read as powers of two: 512 + 64 + 32 + 16 + 1 = 625.
In historical numeral systems
Egyptian
6 coils of rope, 2 hobbles, 5 strokes
6 × 100 + 2 × 10 + 5 × 1 = 625. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge (sixties place), 2 corner wedges + 5 vertical wedges (units place)
10 × 60 + 25 = 625. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then kappa, then epsilon, marked as a numeral
chi-kappa-epsilon + keraia
chi + kappa + epsilon written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then resh, then kaf, then he
tav-resh-kaf-he
tav (400) + resh (200) + kaf (20) + he (5) = 625, written in descending order.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Powerful number
- Automorphic number
Related numbers & connections
Both are nickel superalloys; one is used where corrosion dominates and the other where high-temperature strength does.
View 718 →Other connections
- is associated with718
why?
Strength 0.50, confidence "high".
Technology & computing
Alloy 625 is a nickel-chromium-molybdenum-niobium superalloy resistant to high-temperature oxidation and to a wide range of corrosive media.
DocumentedTechnology & computingGeography: International — AISI, SAE and Aluminium Association designations
Common questions
Is 625 a prime number?
No, 625 is not prime.
What are the factors of 625?
The factors of 625 are 1, 5, 25, 125, 625.
What is 625 in Roman numerals?
625 in Roman numerals is DCXXV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026