13620512720 has 20 divisors (see below), whose sum is σ = 31667692260. Its totient is φ = 5448205056.

The previous prime is 13620512699. The next prime is 13620512747. The reversal of 13620512720 is 2721502631.

It is a happy number.

13620512720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7630371904 + 5990140816 = 87352^2 + 77396^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85128125 + ... + 85128284.

It is an arithmetic number, because the mean of its divisors is an integer number (1583384613).

Almost surely, 2^13620512720 is an apocalyptic number.

13620512720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13620512720 is an abundant number, since it is smaller than the sum of its proper divisors (18047179540).

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

13620512720 is a wasteful number, since it uses less digits than its factorization.

13620512720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170256422 (or 170256416 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The spelling of 13620512720 in words is "thirteen billion, six hundred twenty million, five hundred twelve thousand, seven hundred twenty".