638468082 has 80 divisors (see below), whose sum is σ = 1731248640. Its totient is φ = 171683712.

The previous prime is 638468059. The next prime is 638468101. The reversal of 638468082 is 280864836.

It is a happy number.

638468082 is a `hidden beast` number, since 638 + 4 + 6 + 8 + 0 + 8 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2719 + ... + 35837.

It is an arithmetic number, because the mean of its divisors is an integer number (21640608).

Almost surely, 2^638468082 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638468082, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865624320).

638468082 is an abundant number, since it is smaller than the sum of its proper divisors (1092780558).

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

638468082 is a wasteful number, since it uses less digits than its factorization.

638468082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33157 (or 33148 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 638468082 is about 25267.9259536670. The cubic root of 638468082 is about 861.0857397407.

The spelling of 638468082 in words is "six hundred thirty-eight million, four hundred sixty-eight thousand, eighty-two".