9888888887 has 2 divisors, whose sum is σ = 9888888888. Its totient is φ = 9888888886.

The previous prime is 9888888881. The next prime is 9888888931. The reversal of 9888888887 is 7888888889.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9888888887 - 2⁴ = 9888888871 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9888888881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4944444443 + 4944444444.

It is an arithmetic number, because the mean of its divisors is an integer number (4944444444).

Almost surely, 2^9888888887 is an apocalyptic number.

9888888887 is a deficient number, since it is larger than the sum of its proper divisors (1).

9888888887 is an equidigital number, since it uses as much as digits as its factorization.

9888888887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1056964608, while the sum is 80.

The square root of 9888888887 is about 99442.8925916780. The cubic root of 9888888887 is about 2146.4255650763.

The spelling of 9888888887 in words is "nine billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-seven".