6671638 has 4 divisors (see below), whose sum is σ = 10007460. Its totient is φ = 3335818.

The previous prime is 6671627. The next prime is 6671647. The reversal of 6671638 is 8361766.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6671597 and 6671606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1667908 + ... + 1667911.

It is an arithmetic number, because the mean of its divisors is an integer number (2501865).

Almost surely, 2^6671638 is an apocalyptic number.

6671638 is a deficient number, since it is larger than the sum of its proper divisors (3335822).

6671638 is a wasteful number, since it uses less digits than its factorization.

6671638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335821.

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

The square root of 6671638 is about 2582.9514126286. The cubic root of 6671638 is about 188.2539761903.

The spelling of 6671638 in words is "six million, six hundred seventy-one thousand, six hundred thirty-eight".