63871640448 has 128 divisors (see below), whose sum is σ = 211523063040. Its totient is φ = 16590028800.

The previous prime is 63871640419. The next prime is 63871640501. The reversal of 63871640448 is 84404617836.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 63871640448.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1050513 + ... + 1109648.

It is an arithmetic number, because the mean of its divisors is an integer number (1652523930).

Almost surely, 2^63871640448 is an apocalyptic number.

It is an amenable number.

63871640448 is an abundant number, since it is smaller than the sum of its proper divisors (147651422592).

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

63871640448 is a wasteful number, since it uses less digits than its factorization.

63871640448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160196 (or 2160184 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 63871640448 in words is "sixty-three billion, eight hundred seventy-one million, six hundred forty thousand, four hundred forty-eight".