638744125 has 16 divisors (see below), whose sum is σ = 816601968. Its totient is φ = 498528000.

The previous prime is 638744083. The next prime is 638744129. The reversal of 638744125 is 521447836.

638744125 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 8 ways, for example, as 186841561 + 451902564 = 13669^2 + 21258^2 .

It is not a de Polignac number, because 638744125 - 2⁹ = 638743613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638744129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57192 + ... + 67441.

It is an arithmetic number, because the mean of its divisors is an integer number (51037623).

Almost surely, 2^638744125 is an apocalyptic number.

It is an amenable number.

638744125 is a deficient number, since it is larger than the sum of its proper divisors (177857843).

638744125 is a wasteful number, since it uses less digits than its factorization.

638744125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124689 (or 124679 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The square root of 638744125 is about 25273.3876834903. The cubic root of 638744125 is about 861.2098192625.

The spelling of 638744125 in words is "six hundred thirty-eight million, seven hundred forty-four thousand, one hundred twenty-five".