63684399768 has 128 divisors (see below), whose sum is σ = 174638661120. Its totient is φ = 19192642560.

The previous prime is 63684399761. The next prime is 63684399799. The reversal of 63684399768 is 86799348636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63684399761) 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, 65857221 + ... + 65858187.

It is an arithmetic number, because the mean of its divisors is an integer number (1364364540).

Almost surely, 2^63684399768 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 63684399768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87319330560).

63684399768 is an abundant number, since it is smaller than the sum of its proper divisors (110954261352).

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

63684399768 is a wasteful number, since it uses less digits than its factorization.

63684399768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2093 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 69.

The spelling of 63684399768 in words is "sixty-three billion, six hundred eighty-four million, three hundred ninety-nine thousand, seven hundred sixty-eight".