68445305 has 4 divisors (see below), whose sum is σ = 82134372. Its totient is φ = 54756240.

The previous prime is 68445283. The next prime is 68445317. The reversal of 68445305 is 50354486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23541904 + 44903401 = 4852^2 + 6701^2 .

It is not a de Polignac number, because 68445305 - 2¹⁰ = 68444281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 6844526 + ... + 6844535.

It is an arithmetic number, because the mean of its divisors is an integer number (20533593).

Almost surely, 2^68445305 is an apocalyptic number.

It is an amenable number.

68445305 is a deficient number, since it is larger than the sum of its proper divisors (13689067).

68445305 is a wasteful number, since it uses less digits than its factorization.

68445305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13689066.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 68445305 is about 8273.1677729876. The cubic root of 68445305 is about 409.0545436511.

The spelling of 68445305 in words is "sixty-eight million, four hundred forty-five thousand, three hundred five".