64388945808 has 240 divisors, whose sum is σ = 204618665472. Its totient is φ = 18880646400.

The previous prime is 64388945801. The next prime is 64388945857. The reversal of 64388945808 is 80854988346.

64388945808 is a `hidden beast` number, since 6 + 43 + 8 + 8 + 9 + 4 + 580 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (64388945801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5936166 + ... + 5947002.

Almost surely, 2^64388945808 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 64388945808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102309332736).

64388945808 is an abundant number, since it is smaller than the sum of its proper divisors (140229719664).

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

64388945808 is a wasteful number, since it uses less digits than its factorization.

64388945808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10915 (or 10884 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 63.

The spelling of 64388945808 in words is "sixty-four billion, three hundred eighty-eight million, nine hundred forty-five thousand, eight hundred eight".