68540579 has 2 divisors, whose sum is σ = 68540580. Its totient is φ = 68540578.

The previous prime is 68540573. The next prime is 68540599. The reversal of 68540579 is 97504586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68540579 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (68540573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34270289 + 34270290.

It is an arithmetic number, because the mean of its divisors is an integer number (34270290).

Almost surely, 2^68540579 is an apocalyptic number.

68540579 is a deficient number, since it is larger than the sum of its proper divisors (1).

68540579 is an equidigital number, since it uses as much as digits as its factorization.

68540579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 68540579 is about 8278.9237827148. The cubic root of 68540579 is about 409.2442532486.

The spelling of 68540579 in words is "sixty-eight million, five hundred forty thousand, five hundred seventy-nine".