68778929 has 2 divisors, whose sum is σ = 68778930. Its totient is φ = 68778928.

The previous prime is 68778881. The next prime is 68778937. The reversal of 68778929 is 92987786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68442529 + 336400 = 8273^2 + 580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68778929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68778959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34389464 + 34389465.

It is an arithmetic number, because the mean of its divisors is an integer number (34389465).

Almost surely, 2^68778929 is an apocalyptic number.

It is an amenable number.

68778929 is a deficient number, since it is larger than the sum of its proper divisors (1).

68778929 is an equidigital number, since it uses as much as digits as its factorization.

68778929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 56.

The square root of 68778929 is about 8293.3062767511. The cubic root of 68778929 is about 409.7180869883.

The spelling of 68778929 in words is "sixty-eight million, seven hundred seventy-eight thousand, nine hundred twenty-nine".