639806000 has 160 divisors (see below), whose sum is σ = 1653912000. Its totient is φ = 238694400.

The previous prime is 639805967. The next prime is 639806017. The reversal of 639806000 is 608936.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4293926 + ... + 4294074.

It is an arithmetic number, because the mean of its divisors is an integer number (10336950).

Almost surely, 2^639806000 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 639806000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826956000).

639806000 is an abundant number, since it is smaller than the sum of its proper divisors (1014106000).

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

639806000 is a wasteful number, since it uses less digits than its factorization.

639806000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 639806000 is about 25294.3867290749. The cubic root of 639806000 is about 861.6867921443.

The spelling of 639806000 in words is "six hundred thirty-nine million, eight hundred six thousand".