638299312 has 80 divisors (see below), whose sum is σ = 1485619200. Its totient is φ = 259750656.

The previous prime is 638299297. The next prime is 638299397. The reversal of 638299312 is 213992836.

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 15 ways as a sum of consecutive naturals, for example, 382993 + ... + 384655.

It is an arithmetic number, because the mean of its divisors is an integer number (18570240).

Almost surely, 2^638299312 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 638299312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742809600).

638299312 is an abundant number, since it is smaller than the sum of its proper divisors (847319888).

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

638299312 is a wasteful number, since it uses less digits than its factorization.

638299312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 1844 counting only the distinct ones).

The product of its digits is 139968, while the sum is 43.

The square root of 638299312 is about 25264.5861236633. The cubic root of 638299312 is about 861.0098611123.

The spelling of 638299312 in words is "six hundred thirty-eight million, two hundred ninety-nine thousand, three hundred twelve".