64140430128 has 80 divisors (see below), whose sum is σ = 175166110080. Its totient is φ = 20167875072.

The previous prime is 64140430127. The next prime is 64140430153. The reversal of 64140430128 is 82103404146.

64140430128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64140430128² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64140430127) 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, 61575 + ... + 363417.

It is an arithmetic number, because the mean of its divisors is an integer number (2189576376).

Almost surely, 2^64140430128 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 64140430128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87583055040).

64140430128 is an abundant number, since it is smaller than the sum of its proper divisors (111025679952).

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

64140430128 is a wasteful number, since it uses less digits than its factorization.

64140430128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302106 (or 302100 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 64140430128 in words is "sixty-four billion, one hundred forty million, four hundred thirty thousand, one hundred twenty-eight".