669648 has 40 divisors (see below), whose sum is σ = 1978048. Its totient is φ = 191232.

The previous prime is 669637. The next prime is 669649. The reversal of 669648 is 846966.

669648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 669648.

It is not an unprimeable number, because it can be changed into a prime (669649) by changing a digit.

669648 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, 661 + ... + 1332.

2⁶⁶⁹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

669648 is an abundant number, since it is smaller than the sum of its proper divisors (1308400).

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

669648 is a wasteful number, since it uses less digits than its factorization.

669648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011 (or 2005 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 669648 is about 818.3202307166. The cubic root of 669648 is about 87.4880745652.

The spelling of 669648 in words is "six hundred sixty-nine thousand, six hundred forty-eight".