668170 has 16 divisors (see below), whose sum is σ = 1215720. Its totient is φ = 264384.

The previous prime is 668159. The next prime is 668179. The reversal of 668170 is 71866.

It can be written as a sum of positive squares in 4 ways, for example, as 373321 + 294849 = 611^2 + 543^2 .

It is a super-2 number, since 2×668170² = 892902297800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668179) by changing a digit.

668170 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 784 + ... + 1396.

2⁶⁶⁸¹⁷⁰ is an apocalyptic number.

668170 is a deficient number, since it is larger than the sum of its proper divisors (547550).

668170 is a wasteful number, since it uses less digits than its factorization.

668170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 668170 is about 817.4166624189. The cubic root of 668170 is about 87.4236613094.

It can be divided in two parts, 668 and 170, that added together give a palindrome (838).

The spelling of 668170 in words is "six hundred sixty-eight thousand, one hundred seventy".