13135539328 has 128 divisors (see below), whose sum is σ = 29368105200. Its totient is φ = 5821562880.

The previous prime is 13135539317. The next prime is 13135539341. The reversal of 13135539328 is 82393553131.

It can be written as a sum of positive squares in 8 ways, for example, as 8958243904 + 4177295424 = 94648^2 + 64632^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2584726 + ... + 2589802.

Almost surely, 2^13135539328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13135539328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14684052600).

13135539328 is an abundant number, since it is smaller than the sum of its proper divisors (16232565872).

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

13135539328 is a wasteful number, since it uses less digits than its factorization.

13135539328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178 (or 5166 counting only the distinct ones).

The product of its digits is 291600, while the sum is 43.

The spelling of 13135539328 in words is "thirteen billion, one hundred thirty-five million, five hundred thirty-nine thousand, three hundred twenty-eight".