6718638 has 32 divisors (see below), whose sum is σ = 14342400. Its totient is φ = 2090880.

The previous prime is 6718589. The next prime is 6718667. The reversal of 6718638 is 8368176.

6718638 is nontrivially palindromic in base 5.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6718596 and 6718605.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20133 + ... + 20463.

It is an arithmetic number, because the mean of its divisors is an integer number (448200).

Almost surely, 2^6718638 is an apocalyptic number.

6718638 is an abundant number, since it is smaller than the sum of its proper divisors (7623762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6718638 is a wasteful number, since it uses less digits than its factorization.

6718638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552.

The product of its digits is 48384, while the sum is 39.

The square root of 6718638 is about 2592.0335645975. The cubic root of 6718638 is about 188.6950093449.

The spelling of 6718638 in words is "six million, seven hundred eighteen thousand, six hundred thirty-eight".