68643479 has 2 divisors, whose sum is σ = 68643480. Its totient is φ = 68643478.

The previous prime is 68643461. The next prime is 68643499. The reversal of 68643479 is 97434686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68643479 - 2²⁰ = 67594903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68643499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34321739 + 34321740.

It is an arithmetic number, because the mean of its divisors is an integer number (34321740).

Almost surely, 2^68643479 is an apocalyptic number.

68643479 is a deficient number, since it is larger than the sum of its proper divisors (1).

68643479 is an equidigital number, since it uses as much as digits as its factorization.

68643479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 68643479 is about 8285.1360278513. The cubic root of 68643479 is about 409.4489503685.

The spelling of 68643479 in words is "sixty-eight million, six hundred forty-three thousand, four hundred seventy-nine".