2188782764 has 72 divisors (see below), whose sum is σ = 4737706848. Its totient is φ = 880239360.

The previous prime is 2188782727. The next prime is 2188782773. The reversal of 2188782764 is 4672878812.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234344 + ... + 243504.

It is an arithmetic number, because the mean of its divisors is an integer number (65801484).

Almost surely, 2^2188782764 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 2188782764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2368853424).

2188782764 is an abundant number, since it is smaller than the sum of its proper divisors (2548924084).

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

2188782764 is a wasteful number, since it uses less digits than its factorization.

2188782764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9255 (or 9246 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 53.

The square root of 2188782764 is about 46784.4286488571. The cubic root of 2188782764 is about 1298.3772185279.

The spelling of 2188782764 in words is "two billion, one hundred eighty-eight million, seven hundred eighty-two thousand, seven hundred sixty-four".