68428691 has 2 divisors, whose sum is σ = 68428692. Its totient is φ = 68428690.

The previous prime is 68428643. The next prime is 68428721. The reversal of 68428691 is 19682486.

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-68428691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68428391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34214345 + 34214346.

It is an arithmetic number, because the mean of its divisors is an integer number (34214346).

Almost surely, 2^68428691 is an apocalyptic number.

68428691 is a deficient number, since it is larger than the sum of its proper divisors (1).

68428691 is an equidigital number, since it uses as much as digits as its factorization.

68428691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 68428691 is about 8272.1636226564. The cubic root of 68428691 is about 409.0214438296.

The spelling of 68428691 in words is "sixty-eight million, four hundred twenty-eight thousand, six hundred ninety-one".