638884325170 has 32 divisors (see below), whose sum is σ = 1415374507008. Its totient is φ = 202196357568.

The previous prime is 638884325083. The next prime is 638884325173. The reversal of 638884325170 is 71523488836.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (638884325173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351034434 + ... + 351036253.

It is an arithmetic number, because the mean of its divisors is an integer number (44230453344).

Almost surely, 2^638884325170 is an apocalyptic number.

638884325170 is an abundant number, since it is smaller than the sum of its proper divisors (776490181838).

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

638884325170 is a wasteful number, since it uses less digits than its factorization.

638884325170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702070714.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 638884325170 in words is "six hundred thirty-eight billion, eight hundred eighty-four million, three hundred twenty-five thousand, one hundred seventy".