68731643 has 2 divisors, whose sum is σ = 68731644. Its totient is φ = 68731642.

The previous prime is 68731609. The next prime is 68731651. The reversal of 68731643 is 34613786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68731643 - 2¹⁴ = 68715259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68731597 and 68731606.

It is not a weakly prime, because it can be changed into another prime (68731693) 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, 34365821 + 34365822.

It is an arithmetic number, because the mean of its divisors is an integer number (34365822).

Almost surely, 2^68731643 is an apocalyptic number.

68731643 is a deficient number, since it is larger than the sum of its proper divisors (1).

68731643 is an equidigital number, since it uses as much as digits as its factorization.

68731643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 68731643 is about 8290.4549332350. The cubic root of 68731643 is about 409.6241707684.

The spelling of 68731643 in words is "sixty-eight million, seven hundred thirty-one thousand, six hundred forty-three".