665804 has 12 divisors (see below), whose sum is σ = 1215984. Its totient is φ = 318384.

The previous prime is 665803. The next prime is 665813. The reversal of 665804 is 408566.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665804.

It is not an unprimeable number, because it can be changed into a prime (665801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3527 + ... + 3710.

It is an arithmetic number, because the mean of its divisors is an integer number (101332).

2⁶⁶⁵⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

665804 is a deficient number, since it is larger than the sum of its proper divisors (550180).

665804 is a wasteful number, since it uses less digits than its factorization.

665804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264 (or 7262 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 665804 is about 815.9681366328. The cubic root of 665804 is about 87.3203497717.

The spelling of 665804 in words is "six hundred sixty-five thousand, eight hundred four".