2188818828 has 240 divisors, whose sum is σ = 6926760960. Its totient is φ = 596556576.

The previous prime is 2188818817. The next prime is 2188818881. The reversal of 2188818828 is 8288188812.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5963901 + ... + 5964267.

It is an arithmetic number, because the mean of its divisors is an integer number (28861504).

Almost surely, 2^2188818828 is an apocalyptic number.

2188818828 is a gapful number since it is divisible by the number (28) 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 2188818828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463380480).

2188818828 is an abundant number, since it is smaller than the sum of its proper divisors (4737942132).

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

2188818828 is a wasteful number, since it uses less digits than its factorization.

2188818828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 402 counting only the distinct ones).

The product of its digits is 1048576, while the sum is 54.

The square root of 2188818828 is about 46784.8140746546. The cubic root of 2188818828 is about 1298.3843494958.

The spelling of 2188818828 in words is "two billion, one hundred eighty-eight million, eight hundred eighteen thousand, eight hundred twenty-eight".