64445370528 has 288 divisors, whose sum is σ = 213499601280. Its totient is φ = 16661145600.

The previous prime is 64445370523. The next prime is 64445370623. The reversal of 64445370528 is 82507354446.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (64445370523) 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, 18618718 + ... + 18622178.

It is an arithmetic number, because the mean of its divisors is an integer number (741318060).

Almost surely, 2^64445370528 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 64445370528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106749800640).

64445370528 is an abundant number, since it is smaller than the sum of its proper divisors (149054230752).

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

64445370528 is a wasteful number, since it uses less digits than its factorization.

64445370528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732 (or 3713 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 48.

The spelling of 64445370528 in words is "sixty-four billion, four hundred forty-five million, three hundred seventy thousand, five hundred twenty-eight".