638480218 has 8 divisors (see below), whose sum is σ = 1008126720. Its totient is φ = 302437980.

The previous prime is 638480191. The next prime is 638480243. The reversal of 638480218 is 812084836.

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

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, 8401018 + ... + 8401093.

It is an arithmetic number, because the mean of its divisors is an integer number (126015840).

Almost surely, 2^638480218 is an apocalyptic number.

638480218 is a deficient number, since it is larger than the sum of its proper divisors (369646502).

638480218 is a wasteful number, since it uses less digits than its factorization.

638480218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16802132.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 638480218 is about 25268.1660988684. The cubic root of 638480218 is about 861.0911955448.

The spelling of 638480218 in words is "six hundred thirty-eight million, four hundred eighty thousand, two hundred eighteen".