668805 has 8 divisors (see below), whose sum is σ = 1070112. Its totient is φ = 356688.

The previous prime is 668803. The next prime is 668813. The reversal of 668805 is 508866.

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

It is not a de Polignac number, because 668805 - 2¹ = 668803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22279 + ... + 22308.

It is an arithmetic number, because the mean of its divisors is an integer number (133764).

2⁶⁶⁸⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

668805 is a deficient number, since it is larger than the sum of its proper divisors (401307).

668805 is a wasteful number, since it uses less digits than its factorization.

668805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44595.

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

The square root of 668805 is about 817.8049889796. The cubic root of 668805 is about 87.4513471021.

The spelling of 668805 in words is "six hundred sixty-eight thousand, eight hundred five".