669630 has 64 divisors (see below), whose sum is σ = 1850688. Its totient is φ = 153600.

The previous prime is 669611. The next prime is 669637. The reversal of 669630 is 36966.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669637) by changing a digit.

669630 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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6580 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (28917).

2⁶⁶⁹⁶³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925344).

669630 is an abundant number, since it is smaller than the sum of its proper divisors (1181058).

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

669630 is a wasteful number, since it uses less digits than its factorization.

669630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 669630 is about 818.3092325032. The cubic root of 669630 is about 87.4872906711.

The spelling of 669630 in words is "six hundred sixty-nine thousand, six hundred thirty".