68740449856 has 63 divisors (see below), whose sum is σ = 147765418083. Its totient is φ = 31713776640.

The previous prime is 68740449823. The next prime is 68740449857. The reversal of 68740449856 is 65894404786.

The square root of 68740449856 is 262184.

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

It can be written as a sum of positive squares in 4 ways, for example, as 57159246400 + 11581203456 = 239080^2 + 107616^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68740449794 and 68740449803.

It is not an unprimeable number, because it can be changed into a prime (68740449857) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27265876 + ... + 27268396.

Almost surely, 2^68740449856 is an apocalyptic number.

68740449856 is the 262184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68740449856

68740449856 is an abundant number, since it is smaller than the sum of its proper divisors (79024968227).

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

68740449856 is an frugal number, since it uses more digits than its factorization.

68740449856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080 (or 2536 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 61.

The spelling of 68740449856 in words is "sixty-eight billion, seven hundred forty million, four hundred forty-nine thousand, eight hundred fifty-six".