68390306 has 8 divisors (see below), whose sum is σ = 103526940. Its totient is φ = 33881328.

The previous prime is 68390297. The next prime is 68390321. The reversal of 68390306 is 60309386.

It can be written as a sum of positive squares in 2 ways, for example, as 66015625 + 2374681 = 8125^2 + 1541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 156641 + ... + 157076.

Almost surely, 2^68390306 is an apocalyptic number.

68390306 is a deficient number, since it is larger than the sum of its proper divisors (35136634).

68390306 is a wasteful number, since it uses less digits than its factorization.

68390306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313828.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 68390306 is about 8269.8431665903. The cubic root of 68390306 is about 408.9449494796.

The spelling of 68390306 in words is "sixty-eight million, three hundred ninety thousand, three hundred six".