2188988640 has 72 divisors (see below), whose sum is σ = 7469928648. Its totient is φ = 583729920.

The previous prime is 2188988639. The next prime is 2188988699. The reversal of 2188988640 is 468898812.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 758626 + ... + 761505.

It is an arithmetic number, because the mean of its divisors is an integer number (103749009).

Almost surely, 2^2188988640 is an apocalyptic number.

2188988640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2188988640 is an abundant number, since it is smaller than the sum of its proper divisors (5280940008).

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

2188988640 is a wasteful number, since it uses less digits than its factorization.

2188988640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520152 (or 1520141 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 54.

The square root of 2188988640 is about 46786.6288591089. The cubic root of 2188988640 is about 1298.4179255261.

The spelling of 2188988640 in words is "two billion, one hundred eighty-eight million, nine hundred eighty-eight thousand, six hundred forty".