775666 has 8 divisors (see below), whose sum is σ = 1167660. Its totient is φ = 386448.

The previous prime is 775661. The next prime is 775669. The reversal of 775666 is 666577.

It can be written as a sum of positive squares in 2 ways, for example, as 772641 + 3025 = 879^2 + 55^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (775661) by changing a digit.

775666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280 + ... + 1276.

2⁷⁷⁵⁶⁶⁶ is an apocalyptic number.

775666 is a deficient number, since it is larger than the sum of its proper divisors (391994).

775666 is a wasteful number, since it uses less digits than its factorization.

775666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388.

The product of its digits is 52920, while the sum is 37.

The square root of 775666 is about 880.7190244340. The cubic root of 775666 is about 91.8808318448.

It can be divided in two parts, 775 and 666, that added together give a palindrome (1441).

The spelling of 775666 in words is "seven hundred seventy-five thousand, six hundred sixty-six".