805668 has 12 divisors (see below), whose sum is σ = 1879920. Its totient is φ = 268552.

The previous prime is 805639. The next prime is 805687. The reversal of 805668 is 866508.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

805668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33558 + ... + 33581.

It is an arithmetic number, because the mean of its divisors is an integer number (156660).

2⁸⁰⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

805668 is an abundant number, since it is smaller than the sum of its proper divisors (1074252).

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

805668 is a wasteful number, since it uses less digits than its factorization.

805668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67146 (or 67144 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 805668 is about 897.5901068974. The cubic root of 805668 is about 93.0504986468.

The spelling of 805668 in words is "eight hundred five thousand, six hundred sixty-eight".