639307104 has 48 divisors (see below), whose sum is σ = 1685763072. Its totient is φ = 212139648.

The previous prime is 639307091. The next prime is 639307129. The reversal of 639307104 is 401703936.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6477 + ... + 36339.

It is an arithmetic number, because the mean of its divisors is an integer number (35120064).

Almost surely, 2^639307104 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 639307104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842881536).

639307104 is an abundant number, since it is smaller than the sum of its proper divisors (1046455968).

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

639307104 is a wasteful number, since it uses less digits than its factorization.

639307104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30099 (or 30091 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 639307104 is about 25284.5230131003. The cubic root of 639307104 is about 861.4627638816.

The spelling of 639307104 in words is "six hundred thirty-nine million, three hundred seven thousand, one hundred four".