8887638889 has 2 divisors, whose sum is σ = 8887638890. Its totient is φ = 8887638888.

The previous prime is 8887638857. The next prime is 8887638901. The reversal of 8887638889 is 9888367888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7341576489 + 1546062400 = 85683^2 + 39320^2 .

It is a cyclic number.

It is not a de Polignac number, because 8887638889 - 2⁵ = 8887638857 is a prime.

It is not a weakly prime, because it can be changed into another prime (8887633889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4443819444 + 4443819445.

It is an arithmetic number, because the mean of its divisors is an integer number (4443819445).

Almost surely, 2^8887638889 is an apocalyptic number.

It is an amenable number.

8887638889 is a deficient number, since it is larger than the sum of its proper divisors (1).

8887638889 is an equidigital number, since it uses as much as digits as its factorization.

8887638889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 297271296, while the sum is 73.

The square root of 8887638889 is about 94274.2747996504. The cubic root of 8887638889 is about 2071.3912317434.

It can be divided in two parts, 88876 and 38889, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 8887638889 in words is "eight billion, eight hundred eighty-seven million, six hundred thirty-eight thousand, eight hundred eighty-nine".