8687656889 has 4 divisors (see below), whose sum is σ = 8688755856. Its totient is φ = 8686557924.

The previous prime is 8687656883. The next prime is 8687656903. The reversal of 8687656889 is 9886567868.

8687656889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8687656889 - 2²⁰ = 8686608313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8687656883) 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, 537539 + ... + 553464.

It is an arithmetic number, because the mean of its divisors is an integer number (2172188964).

Almost surely, 2^8687656889 is an apocalyptic number.

It is an amenable number.

8687656889 is a deficient number, since it is larger than the sum of its proper divisors (1098967).

8687656889 is a wasteful number, since it uses less digits than its factorization.

8687656889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098966.

The product of its digits is 278691840, while the sum is 71.

The square root of 8687656889 is about 93207.6010258820. The cubic root of 8687656889 is about 2055.7370044713.

The spelling of 8687656889 in words is "eight billion, six hundred eighty-seven million, six hundred fifty-six thousand, eight hundred eighty-nine".