646966828 has 12 divisors (see below), whose sum is σ = 1132920040. Its totient is φ = 323275392.

The previous prime is 646966819. The next prime is 646966843. The reversal of 646966828 is 828669646.

It is an unprimeable number.

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, 44901 + ... + 57532.

Almost surely, 2^646966828 is an apocalyptic number.

It is an amenable number.

646966828 is a deficient number, since it is larger than the sum of its proper divisors (485953212).

646966828 is a wasteful number, since it uses less digits than its factorization.

646966828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104016 (or 104014 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 55.

The square root of 646966828 is about 25435.5426126513. The cubic root of 646966828 is about 864.8895926443.

The spelling of 646966828 in words is "six hundred forty-six million, nine hundred sixty-six thousand, eight hundred twenty-eight".