68078947 has 2 divisors, whose sum is σ = 68078948. Its totient is φ = 68078946.

The previous prime is 68078929. The next prime is 68078951. The reversal of 68078947 is 74987086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68078947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68078947.

It is not a weakly prime, because it can be changed into another prime (68078917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34039473 + 34039474.

It is an arithmetic number, because the mean of its divisors is an integer number (34039474).

Almost surely, 2^68078947 is an apocalyptic number.

68078947 is a deficient number, since it is larger than the sum of its proper divisors (1).

68078947 is an equidigital number, since it uses as much as digits as its factorization.

68078947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 68078947 is about 8250.9967276687. The cubic root of 68078947 is about 408.3234071538.

The spelling of 68078947 in words is "sixty-eight million, seventy-eight thousand, nine hundred forty-seven".