68626140728 has 8 divisors (see below), whose sum is σ = 128674013880. Its totient is φ = 34313070360.

The previous prime is 68626140721. The next prime is 68626140797. The reversal of 68626140728 is 82704162686.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68626140721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4289133788 + ... + 4289133803.

It is an arithmetic number, because the mean of its divisors is an integer number (16084251735).

Almost surely, 2^68626140728 is an apocalyptic number.

It is an amenable number.

68626140728 is a deficient number, since it is larger than the sum of its proper divisors (60047873152).

68626140728 is a wasteful number, since it uses less digits than its factorization.

68626140728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8578267597 (or 8578267593 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 68626140728 in words is "sixty-eight billion, six hundred twenty-six million, one hundred forty thousand, seven hundred twenty-eight".