639317296 has 80 divisors (see below), whose sum is σ = 1317772800. Its totient is φ = 300029184.

The previous prime is 639317281. The next prime is 639317297. The reversal of 639317296 is 692713936.

It is not an unprimeable number, because it can be changed into a prime (639317297) 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 15 ways as a sum of consecutive naturals, for example, 3922111 + ... + 3922273.

It is an arithmetic number, because the mean of its divisors is an integer number (16472160).

Almost surely, 2^639317296 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 639317296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (658886400).

639317296 is an abundant number, since it is smaller than the sum of its proper divisors (678455504).

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

639317296 is a wasteful number, since it uses less digits than its factorization.

639317296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 380 counting only the distinct ones).

The product of its digits is 367416, while the sum is 46.

The square root of 639317296 is about 25284.7245585156. The cubic root of 639317296 is about 861.4673417450.

The spelling of 639317296 in words is "six hundred thirty-nine million, three hundred seventeen thousand, two hundred ninety-six".