63930021984 has 144 divisors (see below), whose sum is σ = 191641842000. Its totient is φ = 20733677568.

The previous prime is 63930021983. The next prime is 63930022049. The reversal of 63930021984 is 48912003936.

It is a happy number.

63930021984 is a `hidden beast` number, since 639 + 3 + 0 + 0 + 2 + 1 + 9 + 8 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63930021983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1155792 + ... + 1209840.

It is an arithmetic number, because the mean of its divisors is an integer number (1330846125).

Almost surely, 2^63930021984 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 63930021984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95820921000).

63930021984 is an abundant number, since it is smaller than the sum of its proper divisors (127711820016).

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

63930021984 is a wasteful number, since it uses less digits than its factorization.

63930021984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54142 (or 54091 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 63930021984 in words is "sixty-three billion, nine hundred thirty million, twenty-one thousand, nine hundred eighty-four".