13680805 has 8 divisors (see below), whose sum is σ = 16503192. Its totient is φ = 10887168.

The previous prime is 13680773. The next prime is 13680809. The reversal of 13680805 is 50808631.

It can be written as a sum of positive squares in 4 ways, for example, as 3682561 + 9998244 = 1919^2 + 3162^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13680805 - 2⁵ = 13680773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13680809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6124 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (2062899).

Almost surely, 2^13680805 is an apocalyptic number.

It is an amenable number.

13680805 is a deficient number, since it is larger than the sum of its proper divisors (2822387).

13680805 is a wasteful number, since it uses less digits than its factorization.

13680805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14375.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 13680805 is about 3698.7572237172. The cubic root of 13680805 is about 239.1684473935.

The spelling of 13680805 in words is "thirteen million, six hundred eighty thousand, eight hundred five".