63439000640 has 224 divisors, whose sum is σ = 162669565440. Its totient is φ = 23480303616.

The previous prime is 63439000631. The next prime is 63439000643. The reversal of 63439000640 is 4600093436.

It is a happy number.

It is a Cunningham number, because it is equal to 251871²-1.

It is a self number, because there is not a number n which added to its sum of digits gives 63439000640.

It is not an unprimeable number, because it can be changed into a prime (63439000643) 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 31 ways as a sum of consecutive naturals, for example, 137017049 + ... + 137017511.

Almost surely, 2^63439000640 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 63439000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81334782720).

63439000640 is an abundant number, since it is smaller than the sum of its proper divisors (99230564800).

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

63439000640 is a wasteful number, since it uses less digits than its factorization.

63439000640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 859 counting only the distinct ones).

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

The spelling of 63439000640 in words is "sixty-three billion, four hundred thirty-nine million, six hundred forty", and thus it is an aban number.