638758325 has 6 divisors (see below), whose sum is σ = 792060354. Its totient is φ = 511006640.

The previous prime is 638758303. The next prime is 638758333. The reversal of 638758325 is 523857836.

638758325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 37478884 + 601279441 = 6122^2 + 24521^2 .

It is not a de Polignac number, because 638758325 - 2⁶ = 638758261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638758325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12775142 + ... + 12775191.

It is an arithmetic number, because the mean of its divisors is an integer number (132010059).

Almost surely, 2^638758325 is an apocalyptic number.

It is an amenable number.

638758325 is a deficient number, since it is larger than the sum of its proper divisors (153302029).

638758325 is a wasteful number, since it uses less digits than its factorization.

638758325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25550343 (or 25550338 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The square root of 638758325 is about 25273.6686098398. The cubic root of 638758325 is about 861.2162011027.

The spelling of 638758325 in words is "six hundred thirty-eight million, seven hundred fifty-eight thousand, three hundred twenty-five".