639827548 has 6 divisors (see below), whose sum is σ = 1119698216. Its totient is φ = 319913772.

The previous prime is 639827537. The next prime is 639827549. The reversal of 639827548 is 845728936.

It is a junction number, because it is equal to n+sod(n) for n = 639827495 and 639827504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639827549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79978440 + ... + 79978447.

Almost surely, 2^639827548 is an apocalyptic number.

It is an amenable number.

639827548 is a deficient number, since it is larger than the sum of its proper divisors (479870668).

639827548 is a wasteful number, since it uses less digits than its factorization.

639827548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159956891 (or 159956889 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The square root of 639827548 is about 25294.8126697946. The cubic root of 639827548 is about 861.6964656071.

The spelling of 639827548 in words is "six hundred thirty-nine million, eight hundred twenty-seven thousand, five hundred forty-eight".