68428447 has 2 divisors, whose sum is σ = 68428448. Its totient is φ = 68428446.

The previous prime is 68428421. The next prime is 68428463. The reversal of 68428447 is 74482486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68428447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68423447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34214223 + 34214224.

It is an arithmetic number, because the mean of its divisors is an integer number (34214224).

Almost surely, 2^68428447 is an apocalyptic number.

68428447 is a deficient number, since it is larger than the sum of its proper divisors (1).

68428447 is an equidigital number, since it uses as much as digits as its factorization.

68428447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 344064, while the sum is 43.

The square root of 68428447 is about 8272.1488743857. The cubic root of 68428447 is about 409.0209576721.

The spelling of 68428447 in words is "sixty-eight million, four hundred twenty-eight thousand, four hundred forty-seven".