2688440988 has 12 divisors (see below), whose sum is σ = 6273029000. Its totient is φ = 896146992.

The previous prime is 2688440987. The next prime is 2688441079. The reversal of 2688440988 is 8890448862.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2688440988² = 14455429891916832288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2688440987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112018363 + ... + 112018386.

Almost surely, 2^2688440988 is an apocalyptic number.

It is an amenable number.

2688440988 is an abundant number, since it is smaller than the sum of its proper divisors (3584588012).

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

2688440988 is a wasteful number, since it uses less digits than its factorization.

2688440988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224036756 (or 224036754 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 57.

The square root of 2688440988 is about 51850.1782832036. The cubic root of 2688440988 is about 1390.4866898106.

The spelling of 2688440988 in words is "two billion, six hundred eighty-eight million, four hundred forty thousand, nine hundred eighty-eight".