68905979 has 2 divisors, whose sum is σ = 68905980. Its totient is φ = 68905978.

The previous prime is 68905957. The next prime is 68906021. The reversal of 68905979 is 97950986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68905979 - 2²⁰ = 67857403 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 68905979.

It is not a weakly prime, because it can be changed into another prime (68905919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34452989 + 34452990.

It is an arithmetic number, because the mean of its divisors is an integer number (34452990).

Almost surely, 2^68905979 is an apocalyptic number.

68905979 is a deficient number, since it is larger than the sum of its proper divisors (1).

68905979 is an equidigital number, since it uses as much as digits as its factorization.

68905979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 68905979 is about 8300.9625345498. The cubic root of 68905979 is about 409.9702119941.

The spelling of 68905979 in words is "sixty-eight million, nine hundred five thousand, nine hundred seventy-nine".