2189779488 has 384 divisors, whose sum is σ = 7496294400. Its totient is φ = 615859200.

The previous prime is 2189779447. The next prime is 2189779489. The reversal of 2189779488 is 8849779812.

2189779488 is a `hidden beast` number, since 2 + 1 + 89 + 7 + 79 + 488 = 666.

It is not an unprimeable number, because it can be changed into a prime (2189779489) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6615483 + ... + 6615813.

It is an arithmetic number, because the mean of its divisors is an integer number (19521600).

Almost surely, 2^2189779488 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 2189779488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3748147200).

2189779488 is an abundant number, since it is smaller than the sum of its proper divisors (5306514912).

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

2189779488 is a wasteful number, since it uses less digits than its factorization.

2189779488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 399 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 63.

The square root of 2189779488 is about 46795.0797413574. The cubic root of 2189779488 is about 1298.5742728553.

The spelling of 2189779488 in words is "two billion, one hundred eighty-nine million, seven hundred seventy-nine thousand, four hundred eighty-eight".