• 74 can be written using four 4's:
• Deleting all the even digits from 274 = 18889465931478580854784 we obtain a prime (1959317557).
74 has 4 divisors (see below), whose sum is σ = 114. Its totient is φ = 36.
The previous prime is 73. The next prime is 79. The reversal of 74 is 47.
Added to its reverse (47) it gives a square (121 = 112).
74 is nontrivially palindromic in base 6.
74 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 49 + 25 = 7^2 + 5^2 .
It is a magnanimous number.
It is an alternating number because its digits alternate between odd and even.
It is a hungry number.
74 is an undulating number in base 6.
It is a Curzon number.
It is a plaindrome in base 5, base 7, base 8, base 11, base 13, base 15 and base 16.
It is a nialpdrome in base 9, base 10, base 12 and base 14.
It is a pernicious number, because its binary representation contains a prime number (3) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17 + ... + 20.
74 is a deficient number, since it is larger than the sum of its proper divisors (40).
74 is a wasteful number, since it uses less digits than its factorization.
74 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 39.
The product of its digits is 28, while the sum is 11.
The square root of 74 is about 8.6023252670. The cubic root of 74 is about 4.1983364538.
Adding to 74 its reverse (47), we get a palindrome (121).
Subtracting from 74 its reverse (47), we obtain a cube (27 = 33).
The spelling of 74 in words is "seventy-four", and thus it is an aban number and an iban number.
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