13578643 has 6 divisors (see below), whose sum is σ = 14703684. Its totient is φ = 12533976.

The previous prime is 13578611. The next prime is 13578647. The reversal of 13578643 is 34687531.

It is not a de Polignac number, because 13578643 - 2⁵ = 13578611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13578647) 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 5 ways as a sum of consecutive naturals, for example, 40005 + ... + 40342.

It is an arithmetic number, because the mean of its divisors is an integer number (2450614).

Almost surely, 2^13578643 is an apocalyptic number.

13578643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13578643 is a deficient number, since it is larger than the sum of its proper divisors (1125041).

13578643 is an equidigital number, since it uses as much as digits as its factorization.

13578643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80373 (or 80360 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 13578643 is about 3684.9210303614. The cubic root of 13578643 is about 238.5716257646.

It can be divided in two parts, 1357 and 8643, that added together give a 4-th power (10000 = 10⁴).

The spelling of 13578643 in words is "thirteen million, five hundred seventy-eight thousand, six hundred forty-three".