13112657720 has 128 divisors (see below), whose sum is σ = 32267289600. Its totient is φ = 4778726400.

The previous prime is 13112657717. The next prime is 13112657801. The reversal of 13112657720 is 2775621131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2209397 + ... + 2215323.

It is an arithmetic number, because the mean of its divisors is an integer number (252088200).

Almost surely, 2^13112657720 is an apocalyptic number.

13112657720 is a gapful number since it is divisible by the number (10) 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 13112657720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16133644800).

13112657720 is an abundant number, since it is smaller than the sum of its proper divisors (19154631880).

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

13112657720 is a wasteful number, since it uses less digits than its factorization.

13112657720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069 (or 6065 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The spelling of 13112657720 in words is "thirteen billion, one hundred twelve million, six hundred fifty-seven thousand, seven hundred twenty".