2659889988 has 120 divisors (see below), whose sum is σ = 8116238592. Its totient is φ = 743769216.

The previous prime is 2659889987. The next prime is 2659890029. The reversal of 2659889988 is 8899889562.

2659889988 is a `hidden beast` number, since 26 + 598 + 8 + 9 + 9 + 8 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2659889987) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 94120 + ... + 119072.

Almost surely, 2^2659889988 is an apocalyptic number.

2659889988 is a gapful number since it is divisible by the number (28) 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 2659889988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4058119296).

2659889988 is an abundant number, since it is smaller than the sum of its proper divisors (5456348604).

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

2659889988 is a wasteful number, since it uses less digits than its factorization.

2659889988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25023 (or 25012 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 72.

The square root of 2659889988 is about 51574.1213012883. The cubic root of 2659889988 is about 1385.5468806085.

The spelling of 2659889988 in words is "two billion, six hundred fifty-nine million, eight hundred eighty-nine thousand, nine hundred eighty-eight".