13391444808 has 144 divisors (see below), whose sum is σ = 42664927500. Its totient is φ = 3783048192.

The previous prime is 13391444791. The next prime is 13391444809. The reversal of 13391444808 is 80844419331.

It can be written as a sum of positive squares in 2 ways, for example, as 13233741444 + 157703364 = 115038^2 + 12558^2 .

It is not an unprimeable number, because it can be changed into a prime (13391444809) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 292668 + ... + 335316.

Almost surely, 2^13391444808 is an apocalyptic number.

13391444808 is a gapful number since it is divisible by the number (18) 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 13391444808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21332463750).

13391444808 is an abundant number, since it is smaller than the sum of its proper divisors (29273482692).

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

13391444808 is a wasteful number, since it uses less digits than its factorization.

13391444808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42764 (or 42750 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 13391444808 in words is "thirteen billion, three hundred ninety-one million, four hundred forty-four thousand, eight hundred eight".