2158636688 has 20 divisors (see below), whose sum is σ = 4504078908. Its totient is φ = 996293760.

The previous prime is 2158636681. The next prime is 2158636699. The reversal of 2158636688 is 8866368512.

It can be written as a sum of positive squares in 2 ways, for example, as 125708944 + 2032927744 = 11212^2 + 45088^2 .

It is not an unprimeable number, because it can be changed into a prime (2158636681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5188823 + ... + 5189238.

Almost surely, 2^2158636688 is an apocalyptic number.

It is an amenable number.

2158636688 is an abundant number, since it is smaller than the sum of its proper divisors (2345442220).

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

2158636688 is a wasteful number, since it uses less digits than its factorization.

2158636688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378082 (or 10378076 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 53.

The square root of 2158636688 is about 46461.1309375913. The cubic root of 2158636688 is about 1292.3887969056.

The spelling of 2158636688 in words is "two billion, one hundred fifty-eight million, six hundred thirty-six thousand, six hundred eighty-eight".