639580320 has 384 divisors, whose sum is σ = 2408071680. Its totient is φ = 158146560.

The previous prime is 639580301. The next prime is 639580327. The reversal of 639580320 is 23085936.

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 (639580327) 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 63 ways as a sum of consecutive naturals, for example, 4073682 + ... + 4073838.

It is an arithmetic number, because the mean of its divisors is an integer number (6271020).

Almost surely, 2^639580320 is an apocalyptic number.

639580320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639580320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1204035840).

639580320 is an abundant number, since it is smaller than the sum of its proper divisors (1768491360).

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

639580320 is a wasteful number, since it uses less digits than its factorization.

639580320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 639580320 is about 25289.9252667935. The cubic root of 639580320 is about 861.5854654169.

The spelling of 639580320 in words is "six hundred thirty-nine million, five hundred eighty thousand, three hundred twenty".