64019405128 has 64 divisors (see below), whose sum is σ = 141269040000. Its totient is φ = 27185046336.

The previous prime is 64019405089. The next prime is 64019405129. The reversal of 64019405128 is 82150491046.

It is not an unprimeable number, because it can be changed into a prime (64019405129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192075 + ... + 406117.

It is an arithmetic number, because the mean of its divisors is an integer number (2207328750).

Almost surely, 2^64019405128 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 64019405128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70634520000).

64019405128 is an abundant number, since it is smaller than the sum of its proper divisors (77249634872).

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

64019405128 is a wasteful number, since it uses less digits than its factorization.

64019405128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214179 (or 214161 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 64019405128 in words is "sixty-four billion, nineteen million, four hundred five thousand, one hundred twenty-eight".