669726 has 24 divisors (see below), whose sum is σ = 1502280. Its totient is φ = 215376.

The previous prime is 669707. The next prime is 669733. The reversal of 669726 is 627966.

It is a congruent number.

It is an unprimeable number.

669726 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (62595).

2⁶⁶⁹⁷²⁶ is an apocalyptic number.

669726 is an abundant number, since it is smaller than the sum of its proper divisors (832554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669726 is a wasteful number, since it uses less digits than its factorization.

669726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1317 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 669726 is about 818.3678879330. The cubic root of 669726 is about 87.4914712776.

The spelling of 669726 in words is "six hundred sixty-nine thousand, seven hundred twenty-six".