63989800638 has 16 divisors (see below), whose sum is σ = 128113904016. Its totient is φ = 21307549760.

The previous prime is 63989800591. The next prime is 63989800639. The reversal of 63989800638 is 83600898936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63989800639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5589753 + ... + 5601188.

It is an arithmetic number, because the mean of its divisors is an integer number (8007119001).

Almost surely, 2^63989800638 is an apocalyptic number.

63989800638 is an abundant number, since it is smaller than the sum of its proper divisors (64124103378).

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

63989800638 is a wasteful number, since it uses less digits than its factorization.

63989800638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11191899.

The product of its (nonzero) digits is 13436928, while the sum is 60.

The spelling of 63989800638 in words is "sixty-three billion, nine hundred eighty-nine million, eight hundred thousand, six hundred thirty-eight".