64729836648 has 96 divisors (see below), whose sum is σ = 177164619840. Its totient is φ = 21348714240.

The previous prime is 64729836637. The next prime is 64729836683. The reversal of 64729836648 is 84663892746.

64729836648 is a `hidden beast` number, since 6 + 472 + 98 + 36 + 6 + 48 = 666.

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 23 ways as a sum of consecutive naturals, for example, 10624083 + ... + 10630173.

It is an arithmetic number, because the mean of its divisors is an integer number (1845464790).

Almost surely, 2^64729836648 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 64729836648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88582309920).

64729836648 is an abundant number, since it is smaller than the sum of its proper divisors (112434783192).

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

64729836648 is a wasteful number, since it uses less digits than its factorization.

64729836648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7639 (or 7632 counting only the distinct ones).

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

The spelling of 64729836648 in words is "sixty-four billion, seven hundred twenty-nine million, eight hundred thirty-six thousand, six hundred forty-eight".