1680686828 has 6 divisors (see below), whose sum is σ = 2941201956. Its totient is φ = 840343412.

The previous prime is 1680686809. The next prime is 1680686849. The reversal of 1680686828 is 8286860861.

It is a self number, because there is not a number n which added to its sum of digits gives 1680686828.

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 as a sum of consecutive naturals, namely, 210085850 + ... + 210085857.

It is an arithmetic number, because the mean of its divisors is an integer number (490200326).

Almost surely, 2^1680686828 is an apocalyptic number.

It is an amenable number.

1680686828 is a deficient number, since it is larger than the sum of its proper divisors (1260515128).

1680686828 is a wasteful number, since it uses less digits than its factorization.

1680686828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420171711 (or 420171709 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 53.

The square root of 1680686828 is about 40996.1806513729. The cubic root of 1680686828 is about 1188.9463705453.

The spelling of 1680686828 in words is "one billion, six hundred eighty million, six hundred eighty-six thousand, eight hundred twenty-eight".