728540065944 has 96 divisors (see below), whose sum is σ = 1995839445600. Its totient is φ = 240061916160.

The previous prime is 728540065927. The next prime is 728540065963. The reversal of 728540065944 is 449560045827.

728540065944 is a `hidden beast` number, since 7 + 2 + 8 + 5 + 40 + 0 + 6 + 594 + 4 = 666.

It is a super-2 number, since 2×728540065944² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3290989 + ... + 3505379.

It is an arithmetic number, because the mean of its divisors is an integer number (20789994225).

Almost surely, 2^728540065944 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 728540065944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997919722800).

728540065944 is an abundant number, since it is smaller than the sum of its proper divisors (1267299379656).

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

728540065944 is a wasteful number, since it uses less digits than its factorization.

728540065944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214945 (or 214938 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 728540065944 in words is "seven hundred twenty-eight billion, five hundred forty million, sixty-five thousand, nine hundred forty-four".