669936 has 40 divisors (see below), whose sum is σ = 1834704. Its totient is φ = 209920.

The previous prime is 669931. The next prime is 669937. The reversal of 669936 is 639966.

It is a junction number, because it is equal to n+sod(n) for n = 669894 and 669903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669931) by changing a digit.

669936 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 7 ways as a sum of consecutive naturals, for example, 406 + ... + 1226.

2⁶⁶⁹⁹³⁶ 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 669936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917352).

669936 is an abundant number, since it is smaller than the sum of its proper divisors (1164768).

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

669936 is a wasteful number, since it uses less digits than its factorization.

669936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 843 counting only the distinct ones).

The product of its digits is 52488, while the sum is 39.

The square root of 669936 is about 818.4961820314. The cubic root of 669936 is about 87.5006149617.

The spelling of 669936 in words is "six hundred sixty-nine thousand, nine hundred thirty-six".