68705617828 has 12 divisors (see below), whose sum is σ = 120759875740. Its totient is φ = 34202796192.

The previous prime is 68705617807. The next prime is 68705617829. The reversal of 68705617828 is 82871650786.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62639077284 + 6066540544 = 250278^2 + 77888^2 .

It is a super-2 number, since 2×68705617828² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68705617829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37502151 + ... + 37503982.

Almost surely, 2^68705617828 is an apocalyptic number.

It is an amenable number.

68705617828 is a deficient number, since it is larger than the sum of its proper divisors (52054257912).

68705617828 is a wasteful number, since it uses less digits than its factorization.

68705617828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75006366 (or 75006364 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 58.

The spelling of 68705617828 in words is "sixty-eight billion, seven hundred five million, six hundred seventeen thousand, eight hundred twenty-eight".