64044793648 has 80 divisors (see below), whose sum is σ = 138402141696. Its totient is φ = 28460030720.

The previous prime is 64044793633. The next prime is 64044793661. The reversal of 64044793648 is 84639744046.

It is a super-2 number, since 2×64044793648² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8375715 + ... + 8383357.

Almost surely, 2^64044793648 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 64044793648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69201070848).

64044793648 is an abundant number, since it is smaller than the sum of its proper divisors (74357348048).

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

64044793648 is a wasteful number, since it uses less digits than its factorization.

64044793648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8716 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 55.

The spelling of 64044793648 in words is "sixty-four billion, forty-four million, seven hundred ninety-three thousand, six hundred forty-eight".