68409793 has 2 divisors, whose sum is σ = 68409794. Its totient is φ = 68409792.

The previous prime is 68409763. The next prime is 68409821. The reversal of 68409793 is 39790486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59783824 + 8625969 = 7732^2 + 2937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68409793 is a prime.

It is a super-3 number, since 3×68409793³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (68409703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34204896 + 34204897.

It is an arithmetic number, because the mean of its divisors is an integer number (34204897).

Almost surely, 2^68409793 is an apocalyptic number.

It is an amenable number.

68409793 is a deficient number, since it is larger than the sum of its proper divisors (1).

68409793 is an equidigital number, since it uses as much as digits as its factorization.

68409793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 68409793 is about 8271.0212791408. The cubic root of 68409793 is about 408.9837871156.

The spelling of 68409793 in words is "sixty-eight million, four hundred nine thousand, seven hundred ninety-three".