638448125 has 20 divisors (see below), whose sum is σ = 911783136. Its totient is φ = 437790000.

The previous prime is 638448121. The next prime is 638448149. The reversal of 638448125 is 521844836.

It is not a de Polignac number, because 638448125 - 2² = 638448121 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 (638448121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 68591 + ... + 77340.

Almost surely, 2^638448125 is an apocalyptic number.

It is an amenable number.

638448125 is a deficient number, since it is larger than the sum of its proper divisors (273335011).

638448125 is an equidigital number, since it uses as much as digits as its factorization.

638448125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145958 (or 145943 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 638448125 is about 25267.5310428225. The cubic root of 638448125 is about 861.0767678137.

The spelling of 638448125 in words is "six hundred thirty-eight million, four hundred forty-eight thousand, one hundred twenty-five".