8691991338 has 32 divisors (see below), whose sum is σ = 17665159680. Its totient is φ = 2850574320.

The previous prime is 8691991337. The next prime is 8691991367. The reversal of 8691991338 is 8331991968.

It is not an unprimeable number, because it can be changed into a prime (8691991337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324393 + ... + 350163.

It is an arithmetic number, because the mean of its divisors is an integer number (552036240).

Almost surely, 2^8691991338 is an apocalyptic number.

8691991338 is an abundant number, since it is smaller than the sum of its proper divisors (8973168342).

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

8691991338 is a wasteful number, since it uses less digits than its factorization.

8691991338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26682.

The product of its digits is 2519424, while the sum is 57.

The square root of 8691991338 is about 93230.8497118845. The cubic root of 8691991338 is about 2056.0788306527.

The spelling of 8691991338 in words is "eight billion, six hundred ninety-one million, nine hundred ninety-one thousand, three hundred thirty-eight".