669708 has 72 divisors (see below), whose sum is σ = 1926288. Its totient is φ = 202176.

The previous prime is 669707. The next prime is 669733. The reversal of 669708 is 807966.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

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 23 ways as a sum of consecutive naturals, for example, 12610 + ... + 12662.

It is an arithmetic number, because the mean of its divisors is an integer number (26754).

2⁶⁶⁹⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963144).

669708 is an abundant number, since it is smaller than the sum of its proper divisors (1256580).

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

669708 is a wasteful number, since it uses less digits than its factorization.

669708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 669708 is about 818.3568903602. The cubic root of 669708 is about 87.4906874443.

The spelling of 669708 in words is "six hundred sixty-nine thousand, seven hundred eight".