13115306528 has 24 divisors (see below), whose sum is σ = 26518620492. Its totient is φ = 6380418816.

The previous prime is 13115306507. The next prime is 13115306531. The reversal of 13115306528 is 82560351131.

It can be written as a sum of positive squares in 2 ways, for example, as 11044328464 + 2070978064 = 105092^2 + 45508^2 .

It is a super-2 number, since 2×13115306528² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5537375 + ... + 5539742.

Almost surely, 2^13115306528 is an apocalyptic number.

It is an amenable number.

13115306528 is an abundant number, since it is smaller than the sum of its proper divisors (13403313964).

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

13115306528 is a wasteful number, since it uses less digits than its factorization.

13115306528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11077164 (or 11077156 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 13115306528 its reverse (82560351131), we get a palindrome (95675657659).

The spelling of 13115306528 in words is "thirteen billion, one hundred fifteen million, three hundred six thousand, five hundred twenty-eight".