9871789785 has 32 divisors (see below), whose sum is σ = 18556207488. Its totient is φ = 4418142720.

The previous prime is 9871789771. The next prime is 9871789817. The reversal of 9871789785 is 5879871789.

It is not a de Polignac number, because 9871789785 - 2⁷ = 9871789657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2298972 + ... + 2303261.

It is an arithmetic number, because the mean of its divisors is an integer number (579881484).

Almost surely, 2^9871789785 is an apocalyptic number.

It is an amenable number.

9871789785 is a deficient number, since it is larger than the sum of its proper divisors (8684417703).

9871789785 is a wasteful number, since it uses less digits than its factorization.

9871789785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4602265.

The product of its digits is 71124480, while the sum is 69.

The square root of 9871789785 is about 99356.8809142074. The cubic root of 9871789785 is about 2145.1877069612.

The spelling of 9871789785 in words is "nine billion, eight hundred seventy-one million, seven hundred eighty-nine thousand, seven hundred eighty-five".