64448453688 has 64 divisors (see below), whose sum is σ = 166793904000. Its totient is φ = 20727487872.

The previous prime is 64448453603. The next prime is 64448453767. The reversal of 64448453688 is 88635484446.

It is a happy number.

It is a Cunningham number, because it is equal to 253867²-1.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983731 + ... + 1047197.

It is an arithmetic number, because the mean of its divisors is an integer number (2606154750).

Almost surely, 2^64448453688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64448453688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83396952000).

64448453688 is an abundant number, since it is smaller than the sum of its proper divisors (102345450312).

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

64448453688 is a wasteful number, since it uses less digits than its factorization.

64448453688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64964 (or 64960 counting only the distinct ones).

The product of its digits is 70778880, while the sum is 60.

The spelling of 64448453688 in words is "sixty-four billion, four hundred forty-eight million, four hundred fifty-three thousand, six hundred eighty-eight".