13072720 has 20 divisors (see below), whose sum is σ = 30394260. Its totient is φ = 5229056.

The previous prime is 13072699. The next prime is 13072739. The reversal of 13072720 is 2727031.

13072720 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 2471184 + 10601536 = 1572^2 + 3256^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 13072691 and 13072700.

It is a congruent number.

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, 81625 + ... + 81784.

It is an arithmetic number, because the mean of its divisors is an integer number (1519713).

Almost surely, 2^13072720 is an apocalyptic number.

13072720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13072720 is an abundant number, since it is smaller than the sum of its proper divisors (17321540).

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

13072720 is a wasteful number, since it uses less digits than its factorization.

13072720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163422 (or 163416 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 13072720 is about 3615.6216616234. The cubic root of 13072720 is about 235.5710872767.

Adding to 13072720 its reverse (2727031), we get a palindrome (15799751).

The spelling of 13072720 in words is "thirteen million, seventy-two thousand, seven hundred twenty".