13680287 has 4 divisors (see below), whose sum is σ = 13904616. Its totient is φ = 13455960.

The previous prime is 13680259. The next prime is 13680299. The reversal of 13680287 is 78208631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78208631 = 67 ⋅1167293.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13680287 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 (13680217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112073 + ... + 112194.

It is an arithmetic number, because the mean of its divisors is an integer number (3476154).

Almost surely, 2^13680287 is an apocalyptic number.

13680287 is a deficient number, since it is larger than the sum of its proper divisors (224329).

13680287 is an equidigital number, since it uses as much as digits as its factorization.

13680287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224328.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 13680287 is about 3698.6871995345. The cubic root of 13680287 is about 239.1654287889.

The spelling of 13680287 in words is "thirteen million, six hundred eighty thousand, two hundred eighty-seven".