639386548 has 48 divisors (see below), whose sum is σ = 1177464960. Its totient is φ = 303408000.

The previous prime is 639386509. The next prime is 639386551. The reversal of 639386548 is 845683936.

It is a junction number, because it is equal to n+sod(n) for n = 639386495 and 639386504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3030163 + ... + 3030373.

It is an arithmetic number, because the mean of its divisors is an integer number (24530520).

Almost surely, 2^639386548 is an apocalyptic number.

It is an amenable number.

639386548 is a deficient number, since it is larger than the sum of its proper divisors (538078412).

639386548 is a wasteful number, since it uses less digits than its factorization.

639386548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 566 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 52.

The square root of 639386548 is about 25286.0939648654. The cubic root of 639386548 is about 861.4984458529.

The spelling of 639386548 in words is "six hundred thirty-nine million, three hundred eighty-six thousand, five hundred forty-eight".