638582460 has 24 divisors (see below), whose sum is σ = 1788031056. Its totient is φ = 170288640.

The previous prime is 638582459. The next prime is 638582471. The reversal of 638582460 is 64285836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5321461 + ... + 5321580.

It is an arithmetic number, because the mean of its divisors is an integer number (74501294).

Almost surely, 2^638582460 is an apocalyptic number.

638582460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638582460 is an abundant number, since it is smaller than the sum of its proper divisors (1149448596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638582460 is a wasteful number, since it uses less digits than its factorization.

638582460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643053 (or 10643051 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 638582460 is about 25270.1891563953. The cubic root of 638582460 is about 861.1371562416.

The spelling of 638582460 in words is "six hundred thirty-eight million, five hundred eighty-two thousand, four hundred sixty".