2187820544 has 80 divisors (see below), whose sum is σ = 5380259808. Its totient is φ = 865492992.

The previous prime is 2187820543. The next prime is 2187820553. The reversal of 2187820544 is 4450287812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187820543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23114 + ... + 70070.

Almost surely, 2^2187820544 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 2187820544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2690129904).

2187820544 is an abundant number, since it is smaller than the sum of its proper divisors (3192439264).

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

2187820544 is an equidigital number, since it uses as much as digits as its factorization.

2187820544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46995 (or 46979 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 41.

The square root of 2187820544 is about 46774.1439686500. The cubic root of 2187820544 is about 1298.1869289499.

The spelling of 2187820544 in words is "two billion, one hundred eighty-seven million, eight hundred twenty thousand, five hundred forty-four".