669691284 has 12 divisors (see below), whose sum is σ = 1562613024. Its totient is φ = 223230424.

The previous prime is 669691273. The next prime is 669691289. The reversal of 669691284 is 482196966.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669691289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27903792 + ... + 27903815.

It is an arithmetic number, because the mean of its divisors is an integer number (130217752).

Almost surely, 2^669691284 is an apocalyptic number.

It is an amenable number.

669691284 is an abundant number, since it is smaller than the sum of its proper divisors (892921740).

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

669691284 is a wasteful number, since it uses less digits than its factorization.

669691284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55807614 (or 55807612 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 669691284 is about 25878.3941541974. The cubic root of 669691284 is about 874.8995951186.

The spelling of 669691284 in words is "six hundred sixty-nine million, six hundred ninety-one thousand, two hundred eighty-four".