68311787 has 2 divisors, whose sum is σ = 68311788. Its totient is φ = 68311786.

The previous prime is 68311751. The next prime is 68311819. The reversal of 68311787 is 78711386.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68311787 - 2⁸ = 68311531 is a prime.

It is not a weakly prime, because it can be changed into another prime (68311487) 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, 34155893 + 34155894.

It is an arithmetic number, because the mean of its divisors is an integer number (34155894).

Almost surely, 2^68311787 is an apocalyptic number.

68311787 is a deficient number, since it is larger than the sum of its proper divisors (1).

68311787 is an equidigital number, since it uses as much as digits as its factorization.

68311787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 68311787 is about 8265.0944943177. The cubic root of 68311787 is about 408.7883861365.

The spelling of 68311787 in words is "sixty-eight million, three hundred eleven thousand, seven hundred eighty-seven".