639342648 has 48 divisors (see below), whose sum is σ = 1978919280. Its totient is φ = 182669184.

The previous prime is 639342637. The next prime is 639342653. The reversal of 639342648 is 846243936.

639342648 is a `hidden beast` number, since 639 + 3 + 4 + 2 + 6 + 4 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 633765 + ... + 634772.

It is an arithmetic number, because the mean of its divisors is an integer number (41227485).

Almost surely, 2^639342648 is an apocalyptic number.

It is an amenable number.

639342648 is an abundant number, since it is smaller than the sum of its proper divisors (1339576632).

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

639342648 is a wasteful number, since it uses less digits than its factorization.

639342648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268556 (or 1268549 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 639342648 is about 25285.2258839030. The cubic root of 639342648 is about 861.4787286998.

The spelling of 639342648 in words is "six hundred thirty-nine million, three hundred forty-two thousand, six hundred forty-eight".