68538028905756 has 24 divisors (see below), whose sum is σ = 177691186052240. Its totient is φ = 22846009635216.

The previous prime is 68538028905751. The next prime is 68538028905767. The reversal of 68538028905756 is 65750982083586.

68538028905756 is a `hidden beast` number, since 6 + 8 + 538 + 0 + 2 + 89 + 0 + 5 + 7 + 5 + 6 = 666.

It is a super-2 number, since 2×68538028905756² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68538028905751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317305689271 + ... + 317305689486.

Almost surely, 2^{68538028905756} is an apocalyptic number.

It is an amenable number.

68538028905756 is an abundant number, since it is smaller than the sum of its proper divisors (109153157146484).

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

68538028905756 is a wasteful number, since it uses less digits than its factorization.

68538028905756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634611378770 (or 634611378762 counting only the distinct ones).

The product of its (nonzero) digits is 870912000, while the sum is 72.

The spelling of 68538028905756 in words is "sixty-eight trillion, five hundred thirty-eight billion, twenty-eight million, nine hundred five thousand, seven hundred fifty-six".