669696 has 48 divisors (see below), whose sum is σ = 1801800. Its totient is φ = 221184.

The previous prime is 669689. The next prime is 669701. The reversal of 669696 is 696966.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669696.

It is an unprimeable number.

669696 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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6090 + ... + 6198.

2⁶⁶⁹⁶⁹⁶ 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 669696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900900).

669696 is an abundant number, since it is smaller than the sum of its proper divisors (1132104).

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

669696 is a wasteful number, since it uses less digits than its factorization.

669696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 114 counting only the distinct ones).

The product of its digits is 104976, while the sum is 42.

The square root of 669696 is about 818.3495585628. The cubic root of 669696 is about 87.4901648810.

It can be divided in two parts, 66 and 9696, that multiplied together give a palindrome (639936).

The spelling of 669696 in words is "six hundred sixty-nine thousand, six hundred ninety-six".