6704639 has 4 divisors (see below), whose sum is σ = 6724200. Its totient is φ = 6685080.

The previous prime is 6704617. The next prime is 6704641. The reversal of 6704639 is 9364076.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6704639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6704599 and 6704608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6704669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9257 + ... + 9954.

It is an arithmetic number, because the mean of its divisors is an integer number (1681050).

Almost surely, 2^6704639 is an apocalyptic number.

6704639 is a deficient number, since it is larger than the sum of its proper divisors (19561).

6704639 is a wasteful number, since it uses less digits than its factorization.

6704639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19560.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 6704639 is about 2589.3317670781. The cubic root of 6704639 is about 188.5638628136.

The spelling of 6704639 in words is "six million, seven hundred four thousand, six hundred thirty-nine".