638456325 has 24 divisors (see below), whose sum is σ = 1136781408. Its totient is φ = 314316480.

The previous prime is 638456309. The next prime is 638456339. The reversal of 638456325 is 523654836.

It is not a de Polignac number, because 638456325 - 2⁴ = 638456309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326439 + ... + 328388.

It is an arithmetic number, because the mean of its divisors is an integer number (47365892).

Almost surely, 2^638456325 is an apocalyptic number.

638456325 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

638456325 is a deficient number, since it is larger than the sum of its proper divisors (498325083).

638456325 is a wasteful number, since it uses less digits than its factorization.

638456325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654853 (or 654848 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 638456325 is about 25267.6933058797. The cubic root of 638456325 is about 861.0804542522.

The spelling of 638456325 in words is "six hundred thirty-eight million, four hundred fifty-six thousand, three hundred twenty-five".