68208929 has 2 divisors, whose sum is σ = 68208930. Its totient is φ = 68208928.

The previous prime is 68208857. The next prime is 68208941. The reversal of 68208929 is 92980286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66863329 + 1345600 = 8177^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 68208929 - 2²⁴ = 51431713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68208929.

It is not a weakly prime, because it can be changed into another prime (68208989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34104464 + 34104465.

It is an arithmetic number, because the mean of its divisors is an integer number (34104465).

Almost surely, 2^68208929 is an apocalyptic number.

It is an amenable number.

68208929 is a deficient number, since it is larger than the sum of its proper divisors (1).

68208929 is an equidigital number, since it uses as much as digits as its factorization.

68208929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 68208929 is about 8258.8697168559. The cubic root of 68208929 is about 408.5831103024.

The spelling of 68208929 in words is "sixty-eight million, two hundred eight thousand, nine hundred twenty-nine".