639196672 has 40 divisors (see below), whose sum is σ = 1280951496. Its totient is φ = 318646272.

The previous prime is 639196661. The next prime is 639196673. The reversal of 639196672 is 276691936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639196673) 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 3 ways as a sum of consecutive naturals, for example, 189303 + ... + 192649.

Almost surely, 2^639196672 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 639196672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (640475748).

639196672 is an abundant number, since it is smaller than the sum of its proper divisors (641754824).

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

639196672 is an equidigital number, since it uses as much as digits as its factorization.

639196672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738 (or 3722 counting only the distinct ones).

The product of its digits is 734832, while the sum is 49.

The square root of 639196672 is about 25282.3391322876. The cubic root of 639196672 is about 861.4131588568.

The spelling of 639196672 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, six hundred seventy-two".