13645678 has 4 divisors (see below), whose sum is σ = 20468520. Its totient is φ = 6822838.

The previous prime is 13645633. The next prime is 13645691. The reversal of 13645678 is 87654631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87654631 = 4957 ⋅17683.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 13645678.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3411418 + ... + 3411421.

It is an arithmetic number, because the mean of its divisors is an integer number (5117130).

Almost surely, 2^13645678 is an apocalyptic number.

13645678 is a deficient number, since it is larger than the sum of its proper divisors (6822842).

13645678 is an equidigital number, since it uses as much as digits as its factorization.

13645678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6822841.

The product of its digits is 120960, while the sum is 40.

The square root of 13645678 is about 3694.0056848900. The cubic root of 13645678 is about 238.9635746849.

The spelling of 13645678 in words is "thirteen million, six hundred forty-five thousand, six hundred seventy-eight".