638461845076 has 96 divisors (see below), whose sum is σ = 1294516339200. Its totient is φ = 272482081920.

The previous prime is 638461845041. The next prime is 638461845079. The reversal of 638461845076 is 670548164836.

It is a self number, because there is not a number n which added to its sum of digits gives 638461845076.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638461845079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71228571 + ... + 71237533.

It is an arithmetic number, because the mean of its divisors is an integer number (13484545200).

Almost surely, 2^638461845076 is an apocalyptic number.

It is an amenable number.

638461845076 is an abundant number, since it is smaller than the sum of its proper divisors (656054494124).

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

638461845076 is a wasteful number, since it uses less digits than its factorization.

638461845076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9749 (or 9747 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 638461845076 in words is "six hundred thirty-eight billion, four hundred sixty-one million, eight hundred forty-five thousand, seventy-six".