2188748640 has 384 divisors, whose sum is σ = 8047226880. Its totient is φ = 495157248.

The previous prime is 2188748599. The next prime is 2188748669. The reversal of 2188748640 is 468478812.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 2188748640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4985541 + ... + 4985979.

It is an arithmetic number, because the mean of its divisors is an integer number (20956320).

Almost surely, 2^2188748640 is an apocalyptic number.

2188748640 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 2188748640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4023613440).

2188748640 is an abundant number, since it is smaller than the sum of its proper divisors (5858478240).

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

2188748640 is a wasteful number, since it uses less digits than its factorization.

2188748640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The square root of 2188748640 is about 46784.0639534447. The cubic root of 2188748640 is about 1298.3704710859.

The spelling of 2188748640 in words is "two billion, one hundred eighty-eight million, seven hundred forty-eight thousand, six hundred forty".