63988549440 has 112 divisors (see below), whose sum is σ = 215114501952. Its totient is φ = 16059867136.

The previous prime is 63988549439. The next prime is 63988549477. The reversal of 63988549440 is 4494588936.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1944114 + ... + 1976753.

It is an arithmetic number, because the mean of its divisors is an integer number (1920665196).

Almost surely, 2^63988549440 is an apocalyptic number.

63988549440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63988549440 is an abundant number, since it is smaller than the sum of its proper divisors (151125952512).

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

63988549440 is a wasteful number, since it uses less digits than its factorization.

63988549440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920904 (or 3920894 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 60.

The spelling of 63988549440 in words is "sixty-three billion, nine hundred eighty-eight million, five hundred forty-nine thousand, four hundred forty".