704639 has 8 divisors (see below), whose sum is σ = 771120. Its totient is φ = 639936.

The previous prime is 704617. The next prime is 704647. The reversal of 704639 is 936407.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-704639 is a prime.

It is a super-2 number, since 2×704639² = 993032240642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (704839) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 467 + ... + 1275.

It is an arithmetic number, because the mean of its divisors is an integer number (96390).

2⁷⁰⁴⁶³⁹ is an apocalyptic number.

704639 is a deficient number, since it is larger than the sum of its proper divisors (66481).

704639 is a wasteful number, since it uses less digits than its factorization.

704639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 704639 is about 839.4277812891. The cubic root of 704639 is about 88.9861106971.

The spelling of 704639 in words is "seven hundred four thousand, six hundred thirty-nine".