638616522 has 32 divisors (see below), whose sum is σ = 1318708224. Its totient is φ = 206020800.

The previous prime is 638616499. The next prime is 638616527. The reversal of 638616522 is 225616836.

It is a Smith number, since the sum of its digits (39) 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 (638616527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34872 + ... + 49932.

It is an arithmetic number, because the mean of its divisors is an integer number (41209632).

Almost surely, 2^638616522 is an apocalyptic number.

638616522 is an abundant number, since it is smaller than the sum of its proper divisors (680091702).

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

638616522 is a wasteful number, since it uses less digits than its factorization.

638616522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15294.

The product of its digits is 103680, while the sum is 39.

The square root of 638616522 is about 25270.8631035824. The cubic root of 638616522 is about 861.1524669932.

The spelling of 638616522 in words is "six hundred thirty-eight million, six hundred sixteen thousand, five hundred twenty-two".