638048398 has 32 divisors (see below), whose sum is σ = 1053360000. Its totient is φ = 288078336.

The previous prime is 638048357. The next prime is 638048399. The reversal of 638048398 is 893840836.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638048399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230728 + ... + 233476.

It is an arithmetic number, because the mean of its divisors is an integer number (32917500).

Almost surely, 2^638048398 is an apocalyptic number.

638048398 is a deficient number, since it is larger than the sum of its proper divisors (415311602).

638048398 is a wasteful number, since it uses less digits than its factorization.

638048398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 638048398 is about 25259.6199100462. The cubic root of 638048398 is about 860.8970259900.

The spelling of 638048398 in words is "six hundred thirty-eight million, forty-eight thousand, three hundred ninety-eight".