638614225 has 24 divisors (see below), whose sum is σ = 849320640. Its totient is φ = 474851520.

The previous prime is 638614219. The next prime is 638614259. The reversal of 638614225 is 522416836.

It is not a de Polignac number, because 638614225 - 2³ = 638614217 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 12492 + ... + 37858.

It is an arithmetic number, because the mean of its divisors is an integer number (35388360).

Almost surely, 2^638614225 is an apocalyptic number.

It is an amenable number.

638614225 is a deficient number, since it is larger than the sum of its proper divisors (210706415).

638614225 is a wasteful number, since it uses less digits than its factorization.

638614225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25449 (or 25444 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 638614225 is about 25270.8176559446. The cubic root of 638614225 is about 861.1514345167.

It can be divided in two parts, 63861 and 4225, that added together give a palindrome (68086).

The spelling of 638614225 in words is "six hundred thirty-eight million, six hundred fourteen thousand, two hundred twenty-five".