669706 has 8 divisors (see below), whose sum is σ = 1014624. Its totient is φ = 331500.

The previous prime is 669701. The next prime is 669707. The reversal of 669706 is 607966.

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

It is a super-2 number, since 2×669706² = 897012252872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (669701) by changing a digit.

669706 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 3 ways as a sum of consecutive naturals, for example, 1420 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (126828).

2⁶⁶⁹⁷⁰⁶ is an apocalyptic number.

669706 is a deficient number, since it is larger than the sum of its proper divisors (344918).

669706 is a wasteful number, since it uses less digits than its factorization.

669706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 669706 is about 818.3556683985. The cubic root of 669706 is about 87.4906003508.

The spelling of 669706 in words is "six hundred sixty-nine thousand, seven hundred six".