638285475 has 24 divisors (see below), whose sum is σ = 1057735872. Its totient is φ = 339632800.

The previous prime is 638285471. The next prime is 638285497. The reversal of 638285475 is 574582836.

638285475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638285475 - 2² = 638285471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638285471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23620 + ... + 42830.

It is an arithmetic number, because the mean of its divisors is an integer number (44072328).

Almost surely, 2^638285475 is an apocalyptic number.

638285475 is a deficient number, since it is larger than the sum of its proper divisors (419450397).

638285475 is a wasteful number, since it uses less digits than its factorization.

638285475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19667 (or 19662 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 48.

The square root of 638285475 is about 25264.3122803689. The cubic root of 638285475 is about 861.0036394337.

The spelling of 638285475 in words is "six hundred thirty-eight million, two hundred eighty-five thousand, four hundred seventy-five".