64808394640 has 160 divisors (see below), whose sum is σ = 166115082240. Its totient is φ = 23318668800.

The previous prime is 64808394559. The next prime is 64808394671. The reversal of 64808394640 is 4649380846.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70520101 + ... + 70521019.

It is an arithmetic number, because the mean of its divisors is an integer number (1038219264).

Almost surely, 2^64808394640 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 64808394640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83057541120).

64808394640 is an abundant number, since it is smaller than the sum of its proper divisors (101306687600).

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

64808394640 is a wasteful number, since it uses less digits than its factorization.

64808394640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 1695 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 52.

The spelling of 64808394640 in words is "sixty-four billion, eight hundred eight million, three hundred ninety-four thousand, six hundred forty".