639308348 has 96 divisors (see below), whose sum is σ = 1366278144. Its totient is φ = 256048128.

The previous prime is 639308347. The next prime is 639308357. The reversal of 639308348 is 843803936.

It is a junction number, because it is equal to n+sod(n) for n = 639308299 and 639308308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639308347) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5033861 + ... + 5033987.

It is an arithmetic number, because the mean of its divisors is an integer number (14232064).

Almost surely, 2^639308348 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639308348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683139072).

639308348 is an abundant number, since it is smaller than the sum of its proper divisors (726969796).

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

639308348 is a wasteful number, since it uses less digits than its factorization.

639308348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 639308348 is about 25284.5476131174. The cubic root of 639308348 is about 861.4633226423.

The spelling of 639308348 in words is "six hundred thirty-nine million, three hundred eight thousand, three hundred forty-eight".