9859491888 has 80 divisors (see below), whose sum is σ = 26144933760. Its totient is φ = 3200501248.

The previous prime is 9859491883. The next prime is 9859491953. The reversal of 9859491888 is 8881949589.

It is not an unprimeable number, because it can be changed into a prime (9859491883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286756 + ... + 319292.

It is an arithmetic number, because the mean of its divisors is an integer number (326811672).

Almost surely, 2^9859491888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9859491888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13072466880).

9859491888 is an abundant number, since it is smaller than the sum of its proper divisors (16285441872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9859491888 is a wasteful number, since it uses less digits than its factorization.

9859491888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32714 (or 32708 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 69.

The square root of 9859491888 is about 99294.9741326317. The cubic root of 9859491888 is about 2144.2965392815.

The spelling of 9859491888 in words is "nine billion, eight hundred fifty-nine million, four hundred ninety-one thousand, eight hundred eighty-eight".