639934848 has 96 divisors (see below), whose sum is σ = 2104574160. Its totient is φ = 182836224.

The previous prime is 639934843. The next prime is 639934861. The reversal of 639934848 is 848439936.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a junction number, because it is equal to n+sod(n) for n = 639934794 and 639934803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639934843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31615 + ... + 47742.

Almost surely, 2^639934848 is an apocalyptic number.

It is an amenable number.

639934848 is an abundant number, since it is smaller than the sum of its proper divisors (1464639312).

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

639934848 is a wasteful number, since it uses less digits than its factorization.

639934848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79384 (or 79369 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 639934848 is about 25296.9335691107. The cubic root of 639934848 is about 861.7446321602.

The spelling of 639934848 in words is "six hundred thirty-nine million, nine hundred thirty-four thousand, eight hundred forty-eight".