1686332728 has 16 divisors (see below), whose sum is σ = 3162309480. Its totient is φ = 843050208.

The previous prime is 1686332719. The next prime is 1686332729. The reversal of 1686332728 is 8272336861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686332729) by changing a digit.

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, 107226 + ... + 121942.

Almost surely, 2^1686332728 is an apocalyptic number.

It is an amenable number.

1686332728 is a deficient number, since it is larger than the sum of its proper divisors (1475976752).

1686332728 is a wasteful number, since it uses less digits than its factorization.

1686332728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29046 (or 29042 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The square root of 1686332728 is about 41064.9817727952. The cubic root of 1686332728 is about 1190.2762176874.

The spelling of 1686332728 in words is "one billion, six hundred eighty-six million, three hundred thirty-two thousand, seven hundred twenty-eight".