67028993 has 2 divisors, whose sum is σ = 67028994. Its totient is φ = 67028992.

The previous prime is 67028989. The next prime is 67028999. The reversal of 67028993 is 39982076.

67028993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36204289 + 30824704 = 6017^2 + 5552^2 .

It is a cyclic number.

It is not a de Polignac number, because 67028993 - 2² = 67028989 is a prime.

It is not a weakly prime, because it can be changed into another prime (67028999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33514496 + 33514497.

It is an arithmetic number, because the mean of its divisors is an integer number (33514497).

Almost surely, 2^67028993 is an apocalyptic number.

It is an amenable number.

67028993 is a deficient number, since it is larger than the sum of its proper divisors (1).

67028993 is an equidigital number, since it uses as much as digits as its factorization.

67028993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 67028993 is about 8187.1236096690. The cubic root of 67028993 is about 406.2133869015.

The spelling of 67028993 in words is "sixty-seven million, twenty-eight thousand, nine hundred ninety-three".