639171468324 has 81 divisors (see below), whose sum is σ = 1705438163793. Its totient is φ = 201814840224.

The previous prime is 639171468319. The next prime is 639171468359. The reversal of 639171468324 is 423864171936.

The square root of 639171468324 is 799482.

It is a perfect power (a square), and thus also a powerful number.

639171468324 is a `hidden beast` number, since 6 + 3 + 9 + 171 + 468 + 3 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 538154288100 + 101017180224 = 733590^2 + 317832^2 .

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 91137442 + ... + 91144454.

Almost surely, 2^639171468324 is an apocalyptic number.

639171468324 is the 799482-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639171468324

639171468324 is an abundant number, since it is smaller than the sum of its proper divisors (1066266695469).

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

639171468324 is an equidigital number, since it uses as much as digits as its factorization.

639171468324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14074 (or 7037 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 639171468324 in words is "six hundred thirty-nine billion, one hundred seventy-one million, four hundred sixty-eight thousand, three hundred twenty-four".