728642857892 has 12 divisors (see below), whose sum is σ = 1286409294156. Its totient is φ = 361097345280.

The previous prime is 728642857853. The next prime is 728642857897. The reversal of 728642857892 is 298758246827.

It can be written as a sum of positive squares in 2 ways, for example, as 319421650276 + 409221207616 = 565174^2 + 639704^2 .

It is not an unprimeable number, because it can be changed into a prime (728642857897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806020409 + ... + 806021312.

It is an arithmetic number, because the mean of its divisors is an integer number (107200774513).

Almost surely, 2^728642857892 is an apocalyptic number.

It is an amenable number.

728642857892 is a deficient number, since it is larger than the sum of its proper divisors (557766436264).

728642857892 is a wasteful number, since it uses less digits than its factorization.

728642857892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612041838 (or 1612041836 counting only the distinct ones).

The product of its digits is 216760320, while the sum is 68.

The spelling of 728642857892 in words is "seven hundred twenty-eight billion, six hundred forty-two million, eight hundred fifty-seven thousand, eight hundred ninety-two".