68778734049 has 81 divisors (see below), whose sum is σ = 108358767153. Its totient is φ = 42032453904.

The previous prime is 68778733999. The next prime is 68778734051. The reversal of 68778734049 is 94043787786.

The square root of 68778734049 is 262257.

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

It is not a de Polignac number, because 68778734049 - 2²¹ = 68776636897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68778734749) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 642791854 + ... + 642791960.

Almost surely, 2^68778734049 is an apocalyptic number.

68778734049 is the 262257-th square number.

68778734049 is the 131129-th centered octagonal number.

It is an amenable number.

68778734049 is a deficient number, since it is larger than the sum of its proper divisors (39580033104).

68778734049 is a wasteful number, since it uses less digits than its factorization.

68778734049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 63.

The spelling of 68778734049 in words is "sixty-eight billion, seven hundred seventy-eight million, seven hundred thirty-four thousand, forty-nine".