65440441728 has 160 divisors (see below), whose sum is σ = 198894785760. Its totient is φ = 21349204992.

The previous prime is 65440441697. The next prime is 65440441739. The reversal of 65440441728 is 82714404456.

65440441728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 420150 + ... + 554442.

It is an arithmetic number, because the mean of its divisors is an integer number (1243092411).

Almost surely, 2^65440441728 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 65440441728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99447392880).

65440441728 is an abundant number, since it is smaller than the sum of its proper divisors (133454344032).

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

65440441728 is a wasteful number, since it uses less digits than its factorization.

65440441728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134366 (or 134345 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 45.

The spelling of 65440441728 in words is "sixty-five billion, four hundred forty million, four hundred forty-one thousand, seven hundred twenty-eight".