63434891808 has 144 divisors (see below), whose sum is σ = 192860269056. Its totient is φ = 19707770880.

The previous prime is 63434891789. The next prime is 63434891813. The reversal of 63434891808 is 80819843436.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 441393 + ... + 567183.

It is an arithmetic number, because the mean of its divisors is an integer number (1339307424).

Almost surely, 2^63434891808 is an apocalyptic number.

63434891808 is a gapful number since it is divisible by the number (68) 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 63434891808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96430134528).

63434891808 is an abundant number, since it is smaller than the sum of its proper divisors (129425377248).

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

63434891808 is a wasteful number, since it uses less digits than its factorization.

63434891808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125927 (or 125916 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 63434891808 in words is "sixty-three billion, four hundred thirty-four million, eight hundred ninety-one thousand, eight hundred eight".