669688828 has 6 divisors (see below), whose sum is σ = 1171955456. Its totient is φ = 334844412.

The previous prime is 669688813. The next prime is 669688841. The reversal of 669688828 is 828886966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83711100 + ... + 83711107.

Almost surely, 2^669688828 is an apocalyptic number.

It is an amenable number.

669688828 is a deficient number, since it is larger than the sum of its proper divisors (502266628).

669688828 is a wasteful number, since it uses less digits than its factorization.

669688828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167422211 (or 167422209 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 61.

The square root of 669688828 is about 25878.3467014413. The cubic root of 669688828 is about 874.8985255929.

The spelling of 669688828 in words is "six hundred sixty-nine million, six hundred eighty-eight thousand, eight hundred twenty-eight".