9878987656 has 16 divisors (see below), whose sum is σ = 18526564800. Its totient is φ = 4938570384.

The previous prime is 9878987653. The next prime is 9878987681. The reversal of 9878987656 is 6567898789.

9878987656 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (9878987653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68860 + ... + 156523.

It is an arithmetic number, because the mean of its divisors is an integer number (1157910300).

Almost surely, 2^9878987656 is an apocalyptic number.

It is an amenable number.

9878987656 is a deficient number, since it is larger than the sum of its proper divisors (8647577144).

9878987656 is a wasteful number, since it uses less digits than its factorization.

9878987656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230868 (or 230864 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 73.

The square root of 9878987656 is about 99393.0966214455. The cubic root of 9878987656 is about 2145.7089576980.

The spelling of 9878987656 in words is "nine billion, eight hundred seventy-eight million, nine hundred eighty-seven thousand, six hundred fifty-six".