638481338 has 8 divisors (see below), whose sum is σ = 1044787680. Its totient is φ = 290218780.

The previous prime is 638481317. The next prime is 638481341. The reversal of 638481338 is 833184836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14510918 + ... + 14510961.

It is an arithmetic number, because the mean of its divisors is an integer number (130598460).

Almost surely, 2^638481338 is an apocalyptic number.

638481338 is a deficient number, since it is larger than the sum of its proper divisors (406306342).

638481338 is a wasteful number, since it uses less digits than its factorization.

638481338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29021892.

The product of its digits is 331776, while the sum is 44.

The square root of 638481338 is about 25268.1882611318. The cubic root of 638481338 is about 861.0916990433.

The spelling of 638481338 in words is "six hundred thirty-eight million, four hundred eighty-one thousand, three hundred thirty-eight".