68509823 has 2 divisors, whose sum is σ = 68509824. Its totient is φ = 68509822.

The previous prime is 68509787. The next prime is 68509841. The reversal of 68509823 is 32890586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68509823 - 2⁶ = 68509759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68509423) 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, 34254911 + 34254912.

It is an arithmetic number, because the mean of its divisors is an integer number (34254912).

Almost surely, 2^68509823 is an apocalyptic number.

68509823 is a deficient number, since it is larger than the sum of its proper divisors (1).

68509823 is an equidigital number, since it uses as much as digits as its factorization.

68509823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 68509823 is about 8277.0660864826. The cubic root of 68509823 is about 409.1830311250.

The spelling of 68509823 in words is "sixty-eight million, five hundred nine thousand, eight hundred twenty-three".