775 has 6 divisors (see below), whose sum is σ = 992.
Its totient is φ = 600.
The previous prime is 773. The next prime is 787. The reversal of 775 is 577.
It can be divided in two parts, 7 and 75, that multiplied together give a palindrome (525).
775 = 33 + 43 + ... + 73.
775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 775 - 21 = 773 is a prime.
It is a plaindrome in base 13 and base 15.
It is a nialpdrome in base 5, base 6 and base 10.
It is a zygodrome in base 2 and base 5.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (773) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10 + ... + 40.
775 is a deficient number, since it is larger than the sum of its proper divisors (217).
775 is a wasteful number, since it uses less digits than its factorization.
775 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 41 (or 36 counting only the distinct ones).
The product of its digits is 245, while the sum is 19.
The square root of 775 is about 27.8388218142.
The cubic root of 775 is about 9.1854527501.
The spelling of 775 in words is "seven hundred seventy-five", and thus it is an aban number and an oban number.