638633060 has 48 divisors (see below), whose sum is σ = 1457141616. Its totient is φ = 233705472.

The previous prime is 638633059. The next prime is 638633081. The reversal of 638633060 is 60336836.

It can be written as a sum of positive squares in 8 ways, for example, as 369869824 + 268763236 = 19232^2 + 16394^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 638633060.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18512 + ... + 40248.

It is an arithmetic number, because the mean of its divisors is an integer number (30357117).

Almost surely, 2^638633060 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 638633060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728570808).

638633060 is an abundant number, since it is smaller than the sum of its proper divisors (818508556).

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

638633060 is a wasteful number, since it uses less digits than its factorization.

638633060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21872 (or 21870 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 638633060 is about 25271.1903162475. The cubic root of 638633060 is about 861.1599005709.

Adding to 638633060 its reverse (60336836), we get a palindrome (698969896).

The spelling of 638633060 in words is "six hundred thirty-eight million, six hundred thirty-three thousand, sixty".