1689216728 has 48 divisors (see below), whose sum is σ = 3302991000. Its totient is φ = 809661440.

The previous prime is 1689216721. The next prime is 1689216731. The reversal of 1689216728 is 8276129861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689216721) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 792368 + ... + 794496.

Almost surely, 2^1689216728 is an apocalyptic number.

It is an amenable number.

1689216728 is a deficient number, since it is larger than the sum of its proper divisors (1613774272).

1689216728 is a wasteful number, since it uses less digits than its factorization.

1689216728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276 (or 2231 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 1689216728 is about 41100.0818490669. The cubic root of 1689216728 is about 1190.9543759751.

The spelling of 1689216728 in words is "one billion, six hundred eighty-nine million, two hundred sixteen thousand, seven hundred twenty-eight".