63947778840 has 288 divisors, whose sum is σ = 229097756160. Its totient is φ = 15457981440.

The previous prime is 63947778803. The next prime is 63947778911. The reversal of 63947778840 is 4887774936.

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 71 ways as a sum of consecutive naturals, for example, 16681564 + ... + 16685396.

It is an arithmetic number, because the mean of its divisors is an integer number (795478320).

Almost surely, 2^63947778840 is an apocalyptic number.

63947778840 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 63947778840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114548878080).

63947778840 is an abundant number, since it is smaller than the sum of its proper divisors (165149977320).

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

63947778840 is a wasteful number, since it uses less digits than its factorization.

63947778840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255 (or 4237 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 63.

The spelling of 63947778840 in words is "sixty-three billion, nine hundred forty-seven million, seven hundred seventy-eight thousand, eight hundred forty".