63478829664 has 72 divisors (see below), whose sum is σ = 182305311552. Its totient is φ = 20950099200.

The previous prime is 63478829663. The next prime is 63478829681. The reversal of 63478829664 is 46692887436.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×63478829664² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63478829663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1062064 + ... + 1120239.

It is an arithmetic number, because the mean of its divisors is an integer number (2532018216).

Almost surely, 2^63478829664 is an apocalyptic number.

It is an amenable number.

63478829664 is an abundant number, since it is smaller than the sum of its proper divisors (118826481888).

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

63478829664 is a wasteful number, since it uses less digits than its factorization.

63478829664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182420 (or 2182409 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 63.

The spelling of 63478829664 in words is "sixty-three billion, four hundred seventy-eight million, eight hundred twenty-nine thousand, six hundred sixty-four".