68722439 has 2 divisors, whose sum is σ = 68722440. Its totient is φ = 68722438.

The previous prime is 68722387. The next prime is 68722441. The reversal of 68722439 is 93422786.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68722439 is a prime.

Together with 68722441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68722396 and 68722405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68722499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34361219 + 34361220.

It is an arithmetic number, because the mean of its divisors is an integer number (34361220).

Almost surely, 2^68722439 is an apocalyptic number.

68722439 is a deficient number, since it is larger than the sum of its proper divisors (1).

68722439 is an equidigital number, since it uses as much as digits as its factorization.

68722439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 68722439 is about 8289.8998184538. The cubic root of 68722439 is about 409.6058854052.

The spelling of 68722439 in words is "sixty-eight million, seven hundred twenty-two thousand, four hundred thirty-nine".