639005952 has 144 divisors (see below), whose sum is σ = 1895523840. Its totient is φ = 189751296.

The previous prime is 639005903. The next prime is 639005953. The reversal of 639005952 is 259500936.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 639005952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639005953) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 288433 + ... + 290639.

It is an arithmetic number, because the mean of its divisors is an integer number (13163360).

Almost surely, 2^639005952 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 639005952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947761920).

639005952 is an abundant number, since it is smaller than the sum of its proper divisors (1256517888).

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

639005952 is a wasteful number, since it uses less digits than its factorization.

639005952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268 (or 2254 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 639005952 is about 25278.5670479954. The cubic root of 639005952 is about 861.3274757552.

The spelling of 639005952 in words is "six hundred thirty-nine million, five thousand, nine hundred fifty-two".