2081644180 has 96 divisors (see below), whose sum is σ = 5737052160. Its totient is φ = 614666880.

The previous prime is 2081644151. The next prime is 2081644189. The reversal of 2081644180 is 814461802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081644189) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6312 + ... + 64831.

It is an arithmetic number, because the mean of its divisors is an integer number (59760960).

Almost surely, 2^2081644180 is an apocalyptic number.

2081644180 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 2081644180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2868526080).

2081644180 is an abundant number, since it is smaller than the sum of its proper divisors (3655407980).

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

2081644180 is a wasteful number, since it uses less digits than its factorization.

2081644180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71189 (or 71187 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 2081644180 is about 45625.0389588875. The cubic root of 2081644180 is about 1276.8371168895.

The spelling of 2081644180 in words is "two billion, eighty-one million, six hundred forty-four thousand, one hundred eighty".