8689727989 has 2 divisors, whose sum is σ = 8689727990. Its totient is φ = 8689727988.

The previous prime is 8689727953. The next prime is 8689728029. The reversal of 8689727989 is 9897279868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5345072100 + 3344655889 = 73110^2 + 57833^2 .

It is a cyclic number.

It is not a de Polignac number, because 8689727989 - 2⁷ = 8689727861 is a prime.

It is a super-2 number, since 2×8689727989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8689727689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4344863994 + 4344863995.

It is an arithmetic number, because the mean of its divisors is an integer number (4344863995).

Almost surely, 2^8689727989 is an apocalyptic number.

It is an amenable number.

8689727989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8689727989 is an equidigital number, since it uses as much as digits as its factorization.

8689727989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 73.

The square root of 8689727989 is about 93218.7105092105. The cubic root of 8689727989 is about 2055.9003511088.

The spelling of 8689727989 in words is "eight billion, six hundred eighty-nine million, seven hundred twenty-seven thousand, nine hundred eighty-nine".