13687777 has 4 divisors (see below), whose sum is σ = 13861120. Its totient is φ = 13514436.

The previous prime is 13687741. The next prime is 13687787. The reversal of 13687777 is 77778631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13687777 - 2⁷ = 13687649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13687787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86553 + ... + 86710.

It is an arithmetic number, because the mean of its divisors is an integer number (3465280).

Almost surely, 2^13687777 is an apocalyptic number.

It is an amenable number.

13687777 is a deficient number, since it is larger than the sum of its proper divisors (173343).

13687777 is an equidigital number, since it uses as much as digits as its factorization.

13687777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173342.

The product of its digits is 345744, while the sum is 46.

The square root of 13687777 is about 3699.6995823985. The cubic root of 13687777 is about 239.2090687661.

The spelling of 13687777 in words is "thirteen million, six hundred eighty-seven thousand, seven hundred seventy-seven".