775668 has 24 divisors (see below), whose sum is σ = 1859872. Its totient is φ = 251424.

The previous prime is 775661. The next prime is 775669. The reversal of 775668 is 866577.

It is a congruent number.

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

775668 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 7 ways as a sum of consecutive naturals, for example, 430 + ... + 1317.

2⁷⁷⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

775668 is an abundant number, since it is smaller than the sum of its proper divisors (1084204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

775668 is a wasteful number, since it uses less digits than its factorization.

775668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791 (or 1789 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 775668 is about 880.7201598692. The cubic root of 775668 is about 91.8809108141.

Subtracting 775668 from its reverse (866577), we obtain a palindrome (90909).

The spelling of 775668 in words is "seven hundred seventy-five thousand, six hundred sixty-eight".