638242152 has 64 divisors (see below), whose sum is σ = 1706987520. Its totient is φ = 198156288.

The previous prime is 638242151. The next prime is 638242177. The reversal of 638242152 is 251242836.

It is a super-2 number, since 2×638242152² = 814706089179182208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638242151) 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, 31513 + ... + 47639.

It is an arithmetic number, because the mean of its divisors is an integer number (26671680).

Almost surely, 2^638242152 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 638242152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853493760).

638242152 is an abundant number, since it is smaller than the sum of its proper divisors (1068745368).

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

638242152 is a wasteful number, since it uses less digits than its factorization.

638242152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16250 (or 16246 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 638242152 is about 25263.4548706229. The cubic root of 638242152 is about 860.9841590673.

Adding to 638242152 its reverse (251242836), we get a palindrome (889484988).

The spelling of 638242152 in words is "six hundred thirty-eight million, two hundred forty-two thousand, one hundred fifty-two".