9999987287 has 2 divisors, whose sum is σ = 9999987288. Its totient is φ = 9999987286.

The previous prime is 9999987281. The next prime is 9999987293. The reversal of 9999987287 is 7827899999.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (9999987281) and next prime (9999987293).

It is a cyclic number.

It is not a de Polignac number, because 9999987287 - 2³⁰ = 8926245463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999987281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999993643 + 4999993644.

It is an arithmetic number, because the mean of its divisors is an integer number (4999993644).

Almost surely, 2^9999987287 is an apocalyptic number.

9999987287 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999987287 is an equidigital number, since it uses as much as digits as its factorization.

9999987287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370355328, while the sum is 77.

The square root of 9999987287 is about 99999.9364349798. The cubic root of 9999987287 is about 2154.4337770539.

The spelling of 9999987287 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-seven thousand, two hundred eighty-seven".