638751325 has 12 divisors (see below), whose sum is σ = 792675828. Its totient is φ = 510598400.

The previous prime is 638751299. The next prime is 638751343. The reversal of 638751325 is 523157836.

It can be written as a sum of positive squares in 6 ways, for example, as 1996569 + 636754756 = 1413^2 + 25234^2 .

It is not a de Polignac number, because 638751325 - 2⁵ = 638751293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24639 + ... + 43411.

It is an arithmetic number, because the mean of its divisors is an integer number (66056319).

Almost surely, 2^638751325 is an apocalyptic number.

It is an amenable number.

638751325 is a deficient number, since it is larger than the sum of its proper divisors (153924503).

638751325 is a wasteful number, since it uses less digits than its factorization.

638751325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20144 (or 20139 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 638751325 is about 25273.5301254099. The cubic root of 638751325 is about 861.2130551369.

The spelling of 638751325 in words is "six hundred thirty-eight million, seven hundred fifty-one thousand, three hundred twenty-five".