639328032 has 192 divisors, whose sum is σ = 2189456640. Its totient is φ = 177666048.

The previous prime is 639328013. The next prime is 639328037. The reversal of 639328032 is 230823936.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (639328037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222348 + ... + 225204.

It is an arithmetic number, because the mean of its divisors is an integer number (11403420).

Almost surely, 2^639328032 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 639328032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094728320).

639328032 is an abundant number, since it is smaller than the sum of its proper divisors (1550128608).

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

639328032 is a wasteful number, since it uses less digits than its factorization.

639328032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2906 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 639328032 is about 25284.9368597195. The cubic root of 639328032 is about 861.4721639002.

The spelling of 639328032 in words is "six hundred thirty-nine million, three hundred twenty-eight thousand, thirty-two".