6728987897 has 16 divisors (see below), whose sum is σ = 6887559168. Its totient is φ = 6572172480.

The previous prime is 6728987891. The next prime is 6728987911. The reversal of 6728987897 is 7987898276.

It is a cyclic number.

It is not a de Polignac number, because 6728987897 - 2¹² = 6728983801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6728987897.

It is not an unprimeable number, because it can be changed into a prime (6728987891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6844868 + ... + 6845850.

It is an arithmetic number, because the mean of its divisors is an integer number (430472448).

Almost surely, 2^6728987897 is an apocalyptic number.

It is an amenable number.

6728987897 is a deficient number, since it is larger than the sum of its proper divisors (158571271).

6728987897 is a wasteful number, since it uses less digits than its factorization.

6728987897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its digits is 170698752, while the sum is 71.

The square root of 6728987897 is about 82030.4083678729. The cubic root of 6728987897 is about 1887.9185297761.

The spelling of 6728987897 in words is "six billion, seven hundred twenty-eight million, nine hundred eighty-seven thousand, eight hundred ninety-seven".