704638 has 8 divisors (see below), whose sum is σ = 1153080. Its totient is φ = 320280.

The previous prime is 704617. The next prime is 704647. The reversal of 704638 is 836407.

704638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×704638² = 993029422088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

704638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15993 + ... + 16036.

It is an arithmetic number, because the mean of its divisors is an integer number (144135).

2⁷⁰⁴⁶³⁸ is an apocalyptic number.

704638 is a deficient number, since it is larger than the sum of its proper divisors (448442).

704638 is a wasteful number, since it uses less digits than its factorization.

704638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32042.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 704638 is about 839.4271856451. The cubic root of 704638 is about 88.9860686017.

Subtracting 704638 from its reverse (836407), we obtain a square (131769 = 363²).

The spelling of 704638 in words is "seven hundred four thousand, six hundred thirty-eight".