9855791220 has 72 divisors (see below), whose sum is σ = 30333052512. Its totient is φ = 2389280960.

The previous prime is 9855791213. The next prime is 9855791287. The reversal of 9855791220 is 221975589.

9855791220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 9855791220.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 671514 + ... + 686033.

It is an arithmetic number, because the mean of its divisors is an integer number (421292396).

Almost surely, 2^9855791220 is an apocalyptic number.

It is an amenable number.

9855791220 is an abundant number, since it is smaller than the sum of its proper divisors (20477261292).

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

9855791220 is a wasteful number, since it uses less digits than its factorization.

9855791220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357581 (or 1357568 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 9855791220 is about 99276.3376641181. The cubic root of 9855791220 is about 2144.0282251635.

The spelling of 9855791220 in words is "nine billion, eight hundred fifty-five million, seven hundred ninety-one thousand, two hundred twenty".