64493220648 has 96 divisors (see below), whose sum is σ = 166965667200. Its totient is φ = 20750183424.

The previous prime is 64493220647. The next prime is 64493220667. The reversal of 64493220648 is 84602239446.

It is a super-2 number, since 2×64493220648² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64493220597 and 64493220606.

It is not an unprimeable number, because it can be changed into a prime (64493220641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6005748 + ... + 6016476.

It is an arithmetic number, because the mean of its divisors is an integer number (1739225700).

Almost surely, 2^64493220648 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 64493220648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83482833600).

64493220648 is an abundant number, since it is smaller than the sum of its proper divisors (102472446552).

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

64493220648 is a wasteful number, since it uses less digits than its factorization.

64493220648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10931 (or 10854 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 64493220648 in words is "sixty-four billion, four hundred ninety-three million, two hundred twenty thousand, six hundred forty-eight".