650666728 has 16 divisors (see below), whose sum is σ = 1220782500. Its totient is φ = 325124736.

The previous prime is 650666699. The next prime is 650666747. The reversal of 650666728 is 827666056.

It can be written as a sum of positive squares in 2 ways, for example, as 520661124 + 130005604 = 22818^2 + 11402^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12403 + ... + 38146.

Almost surely, 2^650666728 is an apocalyptic number.

It is an amenable number.

650666728 is a deficient number, since it is larger than the sum of its proper divisors (570115772).

650666728 is a wasteful number, since it uses less digits than its factorization.

650666728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52164 (or 52160 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 650666728 is about 25508.1698285079. The cubic root of 650666728 is about 866.5351814993.

The spelling of 650666728 in words is "six hundred fifty million, six hundred sixty-six thousand, seven hundred twenty-eight".