68821447 has 2 divisors, whose sum is σ = 68821448. Its totient is φ = 68821446.

The previous prime is 68821429. The next prime is 68821469. The reversal of 68821447 is 74412886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68821447 - 2¹⁵ = 68788679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68821547) 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, 34410723 + 34410724.

It is an arithmetic number, because the mean of its divisors is an integer number (34410724).

Almost surely, 2^68821447 is an apocalyptic number.

68821447 is a deficient number, since it is larger than the sum of its proper divisors (1).

68821447 is an equidigital number, since it uses as much as digits as its factorization.

68821447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 40.

The square root of 68821447 is about 8295.8692733191. The cubic root of 68821447 is about 409.8024965861.

The spelling of 68821447 in words is "sixty-eight million, eight hundred twenty-one thousand, four hundred forty-seven".