65294641728 has 140 divisors (see below), whose sum is σ = 194855096700. Its totient is φ = 21618551808.

The previous prime is 65294641723. The next prime is 65294641747. The reversal of 65294641728 is 82714649256.

65294641728 is a `hidden beast` number, since 6 + 5 + 2 + 9 + 464 + 172 + 8 = 666.

65294641728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7602444864 + 57692196864 = 87192^2 + 240192^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (65294641723) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 730150 + ... + 814682.

Almost surely, 2^65294641728 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 65294641728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97427548350).

65294641728 is an abundant number, since it is smaller than the sum of its proper divisors (129560454972).

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

65294641728 is a wasteful number, since it uses less digits than its factorization.

65294641728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84706 (or 84687 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 65294641728 in words is "sixty-five billion, two hundred ninety-four million, six hundred forty-one thousand, seven hundred twenty-eight".