2188978344 has 160 divisors (see below), whose sum is σ = 7419487680. Its totient is φ = 588612096.

The previous prime is 2188978331. The next prime is 2188978369. The reversal of 2188978344 is 4438798812.

It is a happy number.

2188978344 is a `hidden beast` number, since 218 + 89 + 7 + 8 + 344 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 62919 + ... + 91305.

It is an arithmetic number, because the mean of its divisors is an integer number (46371798).

Almost surely, 2^2188978344 is an apocalyptic number.

2188978344 is a gapful number since it is divisible by the number (24) 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 2188978344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3709743840).

2188978344 is an abundant number, since it is smaller than the sum of its proper divisors (5230509336).

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

2188978344 is a wasteful number, since it uses less digits than its factorization.

2188978344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28429 (or 28416 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 2188978344 is about 46786.5188275426. The cubic root of 2188978344 is about 1298.4158898018.

The spelling of 2188978344 in words is "two billion, one hundred eighty-eight million, nine hundred seventy-eight thousand, three hundred forty-four".