68781029 has 2 divisors, whose sum is σ = 68781030. Its totient is φ = 68781028.

The previous prime is 68781023. The next prime is 68781043. The reversal of 68781029 is 92018786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 388129 = 8270^2 + 623^2 .

It is a cyclic number.

It is not a de Polignac number, because 68781029 - 2²⁰ = 67732453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68781023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34390514 + 34390515.

It is an arithmetic number, because the mean of its divisors is an integer number (34390515).

Almost surely, 2^68781029 is an apocalyptic number.

It is an amenable number.

68781029 is a deficient number, since it is larger than the sum of its proper divisors (1).

68781029 is an equidigital number, since it uses as much as digits as its factorization.

68781029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 68781029 is about 8293.4328839148. The cubic root of 68781029 is about 409.7222568663.

The spelling of 68781029 in words is "sixty-eight million, seven hundred eighty-one thousand, twenty-nine".