68135094728 has 16 divisors (see below), whose sum is σ = 127756239180. Its totient is φ = 34066764288.

The previous prime is 68135094697. The next prime is 68135094791. The reversal of 68135094728 is 82749053186.

It is a Cunningham number, because it is equal to 261027²-1.

It can be written as a sum of positive squares in 2 ways, for example, as 67640566084 + 494528644 = 260078^2 + 22238^2 .

It is a super-2 number, since 2×68135094728² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68135094728.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456800 + ... + 587312.

It is a 2-persistent number, because it is pandigital, and so is 2⋅68135094728 = 136270189456, but 3⋅68135094728 = 204405284184 is not.

Almost surely, 2^68135094728 is an apocalyptic number.

It is an amenable number.

68135094728 is a deficient number, since it is larger than the sum of its proper divisors (59621144452).

68135094728 is a wasteful number, since it uses less digits than its factorization.

68135094728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195776 (or 195772 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 68135094728 in words is "sixty-eight billion, one hundred thirty-five million, ninety-four thousand, seven hundred twenty-eight".