68509787 has 2 divisors, whose sum is σ = 68509788. Its totient is φ = 68509786.

The previous prime is 68509759. The next prime is 68509823. The reversal of 68509787 is 78790586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68509787 - 2¹⁰ = 68508763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68509717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34254893 + 34254894.

It is an arithmetic number, because the mean of its divisors is an integer number (34254894).

Almost surely, 2^68509787 is an apocalyptic number.

68509787 is a deficient number, since it is larger than the sum of its proper divisors (1).

68509787 is an equidigital number, since it uses as much as digits as its factorization.

68509787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 68509787 is about 8277.0639117987. The cubic root of 68509787 is about 409.1829594536.

It can be divided in two parts, 68509 and 787, that added together give a palindrome (69296).

The spelling of 68509787 in words is "sixty-eight million, five hundred nine thousand, seven hundred eighty-seven".