9887670641 has 4 divisors (see below), whose sum is σ = 9888370800. Its totient is φ = 9886970484.

The previous prime is 9887670607. The next prime is 9887670643. The reversal of 9887670641 is 1460767889.

9887670641 is digitally balanced in base 2, 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 a de Polignac number, because none of the positive numbers 2^k-9887670641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9887670643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328451 + ... + 357288.

It is an arithmetic number, because the mean of its divisors is an integer number (2472092700).

Almost surely, 2^9887670641 is an apocalyptic number.

It is an amenable number.

9887670641 is a deficient number, since it is larger than the sum of its proper divisors (700159).

9887670641 is a wasteful number, since it uses less digits than its factorization.

9887670641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700158.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The square root of 9887670641 is about 99436.7670482101. The cubic root of 9887670641 is about 2146.3374196242.

The spelling of 9887670641 in words is "nine billion, eight hundred eighty-seven million, six hundred seventy thousand, six hundred forty-one".