8688887749 has 2 divisors, whose sum is σ = 8688887750. Its totient is φ = 8688887748.

The previous prime is 8688887747. The next prime is 8688887773. The reversal of 8688887749 is 9477888868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4650285249 + 4038602500 = 68193^2 + 63550^2 .

It is a cyclic number.

It is not a de Polignac number, because 8688887749 - 2¹ = 8688887747 is a prime.

Together with 8688887747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8688887743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4344443874 + 4344443875.

It is an arithmetic number, because the mean of its divisors is an integer number (4344443875).

Almost surely, 2^8688887749 is an apocalyptic number.

It is an amenable number.

8688887749 is a deficient number, since it is larger than the sum of its proper divisors (1).

8688887749 is an equidigital number, since it uses as much as digits as its factorization.

8688887749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 346816512, while the sum is 73.

The square root of 8688887749 is about 93214.2035797120. The cubic root of 8688887749 is about 2055.8340849228.

The spelling of 8688887749 in words is "eight billion, six hundred eighty-eight million, eight hundred eighty-seven thousand, seven hundred forty-nine".