13506878988 has 36 divisors (see below), whose sum is σ = 34868826720. Its totient is φ = 4406498976.

The previous prime is 13506878953. The next prime is 13506878999. The reversal of 13506878988 is 88987860531.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3989703 + ... + 3993086.

It is an arithmetic number, because the mean of its divisors is an integer number (968578520).

Almost surely, 2^13506878988 is an apocalyptic number.

13506878988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13506878988 is an abundant number, since it is smaller than the sum of its proper divisors (21361947732).

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

13506878988 is a wasteful number, since it uses less digits than its factorization.

13506878988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7982846 (or 7982841 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 63.

The spelling of 13506878988 in words is "thirteen billion, five hundred six million, eight hundred seventy-eight thousand, nine hundred eighty-eight".