9890857688085 has 48 divisors (see below), whose sum is σ = 18706958786880. Its totient is φ = 4794478629120.

The previous prime is 9890857688083. The next prime is 9890857688093. The reversal of 9890857688085 is 5808867580989.

It is a happy number.

It is not a de Polignac number, because 9890857688085 - 2¹ = 9890857688083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9890857687995 and 9890857688013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9890857688083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83539 + ... + 4448448.

It is an arithmetic number, because the mean of its divisors is an integer number (389728308060).

Almost surely, 2^{9890857688085} is an apocalyptic number.

It is an amenable number.

9890857688085 is a deficient number, since it is larger than the sum of its proper divisors (8816101098795).

9890857688085 is a wasteful number, since it uses less digits than its factorization.

9890857688085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536418 (or 4536415 counting only the distinct ones).

The product of its (nonzero) digits is 2786918400, while the sum is 81.

The spelling of 9890857688085 in words is "nine trillion, eight hundred ninety billion, eight hundred fifty-seven million, six hundred eighty-eight thousand, eighty-five".