669948 has 12 divisors (see below), whose sum is σ = 1563240. Its totient is φ = 223312.

The previous prime is 669947. The next prime is 669971. The reversal of 669948 is 849966.

It is a tau number, because it is divible by the number of its divisors (12).

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 669948.

It is not an unprimeable number, because it can be changed into a prime (669943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27903 + ... + 27926.

It is an arithmetic number, because the mean of its divisors is an integer number (130270).

2⁶⁶⁹⁹⁴⁸ is an apocalyptic number.

It is an amenable number.

669948 is an abundant number, since it is smaller than the sum of its proper divisors (893292).

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

669948 is a wasteful number, since it uses less digits than its factorization.

669948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55836 (or 55834 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 669948 is about 818.5035125154. The cubic root of 669948 is about 87.5011374002.

The spelling of 669948 in words is "six hundred sixty-nine thousand, nine hundred forty-eight".