63996944640 has 288 divisors, whose sum is σ = 212197418496. Its totient is φ = 16426106880.

The previous prime is 63996944629. The next prime is 63996944707. The reversal of 63996944640 is 4644969936.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11006374 + ... + 11012186.

It is an arithmetic number, because the mean of its divisors is an integer number (736796592).

Almost surely, 2^63996944640 is an apocalyptic number.

63996944640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63996944640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106098709248).

63996944640 is an abundant number, since it is smaller than the sum of its proper divisors (148200473856).

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

63996944640 is a wasteful number, since it uses less digits than its factorization.

63996944640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5945 (or 5931 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 60.

The spelling of 63996944640 in words is "sixty-three billion, nine hundred ninety-six million, nine hundred forty-four thousand, six hundred forty".