68420279 has 2 divisors, whose sum is σ = 68420280. Its totient is φ = 68420278.

The previous prime is 68420249. The next prime is 68420293. The reversal of 68420279 is 97202486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68420279 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 (68420249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34210139 + 34210140.

It is an arithmetic number, because the mean of its divisors is an integer number (34210140).

Almost surely, 2^68420279 is an apocalyptic number.

68420279 is a deficient number, since it is larger than the sum of its proper divisors (1).

68420279 is an equidigital number, since it uses as much as digits as its factorization.

68420279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 68420279 is about 8271.6551548043. The cubic root of 68420279 is about 409.0046826858.

The spelling of 68420279 in words is "sixty-eight million, four hundred twenty thousand, two hundred seventy-nine".