2091818880 has 192 divisors, whose sum is σ = 7316337600. Its totient is φ = 550637568.

The previous prime is 2091818849. The next prime is 2091818903. The reversal of 2091818880 is 888181902.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 452742 + ... + 457338.

It is an arithmetic number, because the mean of its divisors is an integer number (38105925).

Almost surely, 2^2091818880 is an apocalyptic number.

2091818880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091818880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3658168800).

2091818880 is an abundant number, since it is smaller than the sum of its proper divisors (5224518720).

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

2091818880 is a wasteful number, since it uses less digits than its factorization.

2091818880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701 (or 4686 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The square root of 2091818880 is about 45736.4065051027. The cubic root of 2091818880 is about 1278.9140529055.

The spelling of 2091818880 in words is "two billion, ninety-one million, eight hundred eighteen thousand, eight hundred eighty".