13660687 has 4 divisors (see below), whose sum is σ = 13676976. Its totient is φ = 13644400.

The previous prime is 13660663. The next prime is 13660763. The reversal of 13660687 is 78606631.

13660687 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78606631 = 1123 ⋅69997.

It is a cyclic number.

It is not a de Polignac number, because 13660687 - 2¹⁵ = 13627919 is a prime.

It is a super-2 number, since 2×13660687² = 373228738623938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13660637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6814 + ... + 8587.

It is an arithmetic number, because the mean of its divisors is an integer number (3419244).

Almost surely, 2^13660687 is an apocalyptic number.

13660687 is a deficient number, since it is larger than the sum of its proper divisors (16289).

13660687 is an equidigital number, since it uses as much as digits as its factorization.

13660687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16288.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 13660687 is about 3696.0366610736. The cubic root of 13660687 is about 239.0511552878.

The spelling of 13660687 in words is "thirteen million, six hundred sixty thousand, six hundred eighty-seven".