67721734756 has 27 divisors (see below), whose sum is σ = 128343506571. Its totient is φ = 31253062464.

The previous prime is 67721734741. The next prime is 67721734783. The reversal of 67721734756 is 65743712776.

The square root of 67721734756 is 260234.

It is a perfect power (a square), and thus also a powerful number.

67721734756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7311960100 + 60409774656 = 85510^2 + 245784^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67721734697 and 67721734706.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6761080 + ... + 6771088.

Almost surely, 2^67721734756 is an apocalyptic number.

67721734756 is the 260234-th square number.

It is an amenable number.

67721734756 is a deficient number, since it is larger than the sum of its proper divisors (60621771815).

67721734756 is an equidigital number, since it uses as much as digits as its factorization.

67721734756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20048 (or 10024 counting only the distinct ones).

The product of its digits is 10372320, while the sum is 55.

The spelling of 67721734756 in words is "sixty-seven billion, seven hundred twenty-one million, seven hundred thirty-four thousand, seven hundred fifty-six".