65004157728 has 72 divisors (see below), whose sum is σ = 195729445548. Its totient is φ = 20393459712.

The previous prime is 65004157723. The next prime is 65004157769. The reversal of 65004157728 is 82775140056.

65004157728 is a `hidden beast` number, since 6 + 50 + 0 + 4 + 1 + 577 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63328729104 + 1675428624 = 251652^2 + 40932^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (65004157723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6633601 + ... + 6643392.

Almost surely, 2^65004157728 is an apocalyptic number.

65004157728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65004157728 is an abundant number, since it is smaller than the sum of its proper divisors (130725287820).

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

65004157728 is a wasteful number, since it uses less digits than its factorization.

65004157728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13277026 (or 13277015 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 65004157728 in words is "sixty-five billion, four million, one hundred fifty-seven thousand, seven hundred twenty-eight".