68820305 has 4 divisors (see below), whose sum is σ = 82584372. Its totient is φ = 55056240.

The previous prime is 68820293. The next prime is 68820317. The reversal of 68820305 is 50302886.

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

It is an interprime number because it is at equal distance from previous prime (68820293) and next prime (68820317).

It can be written as a sum of positive squares in 2 ways, for example, as 46076944 + 22743361 = 6788^2 + 4769^2 .

It is not a de Polignac number, because 68820305 - 2⁸ = 68820049 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, 6882026 + ... + 6882035.

It is an arithmetic number, because the mean of its divisors is an integer number (20646093).

Almost surely, 2^68820305 is an apocalyptic number.

It is an amenable number.

68820305 is a deficient number, since it is larger than the sum of its proper divisors (13764067).

68820305 is a wasteful number, since it uses less digits than its factorization.

68820305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13764066.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 68820305 is about 8295.8004435980. The cubic root of 68820305 is about 409.8002298652.

The spelling of 68820305 in words is "sixty-eight million, eight hundred twenty thousand, three hundred five".