68637979 has 2 divisors, whose sum is σ = 68637980. Its totient is φ = 68637978.

The previous prime is 68637973. The next prime is 68638007. The reversal of 68637979 is 97973686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68637979 - 2⁷ = 68637851 is a prime.

It is a super-2 number, since 2×68637979² = 9422344322408882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68637973) 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, 34318989 + 34318990.

It is an arithmetic number, because the mean of its divisors is an integer number (34318990).

Almost surely, 2^68637979 is an apocalyptic number.

68637979 is a deficient number, since it is larger than the sum of its proper divisors (1).

68637979 is an equidigital number, since it uses as much as digits as its factorization.

68637979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 55.

The square root of 68637979 is about 8284.8041014860. The cubic root of 68637979 is about 409.4380144942.

The spelling of 68637979 in words is "sixty-eight million, six hundred thirty-seven thousand, nine hundred seventy-nine".