667706 has 16 divisors (see below), whose sum is σ = 1098888. Its totient is φ = 302400.

The previous prime is 667699. The next prime is 667727. The reversal of 667706 is 607766.

667706 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 67081 + 600625 = 259^2 + 775^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376 + ... + 1796.

2⁶⁶⁷⁷⁰⁶ is an apocalyptic number.

667706 is a deficient number, since it is larger than the sum of its proper divisors (431182).

667706 is a wasteful number, since it uses less digits than its factorization.

667706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 667706 is about 817.1327921458. The cubic root of 667706 is about 87.4034199675.

The spelling of 667706 in words is "six hundred sixty-seven thousand, seven hundred six".