68216293 has 2 divisors, whose sum is σ = 68216294. Its totient is φ = 68216292.

The previous prime is 68216279. The next prime is 68216311. The reversal of 68216293 is 39261286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67864644 + 351649 = 8238^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 68216293 - 2⁵ = 68216261 is a prime.

It is a super-3 number, since 3×68216293³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68216243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34108146 + 34108147.

It is an arithmetic number, because the mean of its divisors is an integer number (34108147).

Almost surely, 2^68216293 is an apocalyptic number.

It is an amenable number.

68216293 is a deficient number, since it is larger than the sum of its proper divisors (1).

68216293 is an equidigital number, since it uses as much as digits as its factorization.

68216293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 68216293 is about 8259.3155285411. The cubic root of 68216293 is about 408.5978136450.

The spelling of 68216293 in words is "sixty-eight million, two hundred sixteen thousand, two hundred ninety-three".