13680787 has 4 divisors (see below), whose sum is σ = 14050576. Its totient is φ = 13311000.

The previous prime is 13680773. The next prime is 13680809. The reversal of 13680787 is 78708631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78708631 = 127 ⋅619753.

It is a cyclic number.

It is not a de Polignac number, because 13680787 - 2²³ = 5292179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13680707) 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, 184839 + ... + 184912.

It is an arithmetic number, because the mean of its divisors is an integer number (3512644).

Almost surely, 2^13680787 is an apocalyptic number.

13680787 is a deficient number, since it is larger than the sum of its proper divisors (369789).

13680787 is an equidigital number, since it uses as much as digits as its factorization.

13680787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369788.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 13680787 is about 3698.7547904667. The cubic root of 13680787 is about 239.1683425011.

The spelling of 13680787 in words is "thirteen million, six hundred eighty thousand, seven hundred eighty-seven".