639487468 has 48 divisors (see below), whose sum is σ = 1203471360. Its totient is φ = 296654400.

The previous prime is 639487421. The next prime is 639487481. The reversal of 639487468 is 864784936.

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 15 ways as a sum of consecutive naturals, for example, 585603 + ... + 586693.

It is an arithmetic number, because the mean of its divisors is an integer number (25072320).

Almost surely, 2^639487468 is an apocalyptic number.

It is an amenable number.

639487468 is a deficient number, since it is larger than the sum of its proper divisors (563983892).

639487468 is a wasteful number, since it uses less digits than its factorization.

639487468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1316 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 55.

The square root of 639487468 is about 25288.0894493831. The cubic root of 639487468 is about 861.5437694262.

The spelling of 639487468 in words is "six hundred thirty-nine million, four hundred eighty-seven thousand, four hundred sixty-eight".