6787728869 has 2 divisors, whose sum is σ = 6787728870. Its totient is φ = 6787728868.

The previous prime is 6787728859. The next prime is 6787728877. The reversal of 6787728869 is 9688277876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5994630625 + 793098244 = 77425^2 + 28162^2 .

It is a cyclic number.

It is not a de Polignac number, because 6787728869 - 2¹² = 6787724773 is a prime.

It is a super-2 number, since 2×6787728869² = 92146526398112038322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6787728799 and 6787728808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6787728859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3393864434 + 3393864435.

It is an arithmetic number, because the mean of its divisors is an integer number (3393864435).

Almost surely, 2^6787728869 is an apocalyptic number.

It is an amenable number.

6787728869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6787728869 is an equidigital number, since it uses as much as digits as its factorization.

6787728869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113799168, while the sum is 68.

The square root of 6787728869 is about 82387.6742541019. The cubic root of 6787728869 is about 1893.3961751739.

The spelling of 6787728869 in words is "six billion, seven hundred eighty-seven million, seven hundred twenty-eight thousand, eight hundred sixty-nine".