639906030 has 96 divisors (see below), whose sum is σ = 1727152128. Its totient is φ = 164203200.

The previous prime is 639906017. The next prime is 639906041. The reversal of 639906030 is 30609936.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 588147 + ... + 589233.

It is an arithmetic number, because the mean of its divisors is an integer number (17991168).

Almost surely, 2^639906030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639906030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863576064).

639906030 is an abundant number, since it is smaller than the sum of its proper divisors (1087246098).

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

639906030 is a wasteful number, since it uses less digits than its factorization.

639906030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 36.

The square root of 639906030 is about 25296.3639679698. The cubic root of 639906030 is about 861.7316964008.

The spelling of 639906030 in words is "six hundred thirty-nine million, nine hundred six thousand, thirty".