68309477 has 2 divisors, whose sum is σ = 68309478. Its totient is φ = 68309476.

The previous prime is 68309473. The next prime is 68309509. The reversal of 68309477 is 77490386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58767556 + 9541921 = 7666^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 68309477 - 2² = 68309473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68309473) 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, 34154738 + 34154739.

It is an arithmetic number, because the mean of its divisors is an integer number (34154739).

Almost surely, 2^68309477 is an apocalyptic number.

It is an amenable number.

68309477 is a deficient number, since it is larger than the sum of its proper divisors (1).

68309477 is an equidigital number, since it uses as much as digits as its factorization.

68309477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 68309477 is about 8264.9547488174. The cubic root of 68309477 is about 408.7837782845.

It can be divided in two parts, 68309 and 477, that added together give a palindrome (68786).

The spelling of 68309477 in words is "sixty-eight million, three hundred nine thousand, four hundred seventy-seven".