9001805820 has 96 divisors (see below), whose sum is σ = 29294092800. Its totient is φ = 2022676224.

The previous prime is 9001805777. The next prime is 9001805831. The reversal of 9001805820 is 285081009.

It is a happy number.

9001805820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 156855 + ... + 206414.

It is an arithmetic number, because the mean of its divisors is an integer number (305146800).

Almost surely, 2^9001805820 is an apocalyptic number.

It is an amenable number.

9001805820 is an abundant number, since it is smaller than the sum of its proper divisors (20292286980).

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

9001805820 is a wasteful number, since it uses less digits than its factorization.

9001805820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363347 (or 363345 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 9001805820 is about 94877.8468347591. The cubic root of 9001805820 is about 2080.2229343767. Note that the first 3 decimals are identical.

Adding to 9001805820 its reverse (285081009), we get a palindrome (9286886829).

The spelling of 9001805820 in words is "nine billion, one million, eight hundred five thousand, eight hundred twenty".