Number analysis
74
74 is a composite even number that factors as 2 × 37.
74 is a composite even number that factors as 2 × 37.
The number itself
- Value
- 74
- Digits
- 2
- Digit sum
- 11
- Reversed
- 47
- Palindrome
- No
7 + 4
Digit sum repeated until one digit remains; equals n mod 9 (with 9 for multiples of 9).
Reverses to 47.
Parity and primality
- Parity
- Even
- Prime
- No
- Prime factorisation
- 2 × 37
- Squarefree
- Yes
- Semiprime
- Yes
- Möbius μ(n)
- 1
- Nearest primes
- 73 ← → 79
Divisible by 2.
Composite — it factors as 2 × 37.
2 distinct prime factors, 2 with multiplicity.
No prime divides it twice.
A product of exactly two primes, counted with multiplicity.
(−1) to the power of 2 distinct prime factors.
A gap of 6 between them.
Divisors
- Aliquot sum
- 40
- Classification
- Deficient
1, 2, 37, 74
The proper divisors — everything except n itself.
Its proper divisors fall short by 34.
How many integers from 1 to n share no factor with n.
Sums and additive structure
- Sum of two squares
- Yes
- Sum of three squares
- Yes
- Sum of four squares
- Yes
- Goldbach pair
- 3 + 71
5² + 7² = 74
Legendre's three-square theorem allows it.
Lagrange's four-square theorem: every non-negative integer is, without exception.
The smallest pair of primes summing to n. Goldbach’s conjecture says one always exists; it remains unproven.
Shapes and sequences
- Figurate shapes
- None
Not triangular, square, pentagonal, hexagonal, cubic, Fibonacci, Lucas, Catalan, factorial or a power of two.
Digit curiosities
- Happy number
- No
- Harshad number
- No
- Collatz trajectory
- 22 steps to 1
Summing the squares of its digits falls into the 4 → 16 → 37 → … → 4 cycle.
Not divisible by its digit sum 11.
Peaks at 112 along the way.
Written other ways
- Binary
- 1001010
- Octal
- 112
- Hexadecimal
- 4A
- Base 36
- 22
- Roman numerals
- LXXIV
- In words
- seventy-four
- Scientific notation
- 7.4 × 10^1
Is 74 a prime number?
Composite — it factors as 2 × 37.
Nearby numbers
Other numeral systems
Beyond the bases and Roman numerals above, these notations write 74 their own way.
- Greek (alphabetic)
- ΟΔʹ
- Babylonian cuneiform
- 𒐕𒌋𒐘
- Tamil
- ௭௰௪
References
Further reading: Wikipedia · Wikidata
Notations, naming and the links above come from Wikidata, whose structured data is dedicated to the public domain under CC0-1.0. Retrieved 2026-10-07.