68186309 has 4 divisors (see below), whose sum is σ = 68848416. Its totient is φ = 67524204.

The previous prime is 68186297. The next prime is 68186317. The reversal of 68186309 is 90368186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90368186 = 2 ⋅45184093.

It is a cyclic number.

It is not a de Polignac number, because 68186309 - 2²⁴ = 51409093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68186399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330899 + ... + 331104.

It is an arithmetic number, because the mean of its divisors is an integer number (17212104).

Almost surely, 2^68186309 is an apocalyptic number.

It is an amenable number.

68186309 is a deficient number, since it is larger than the sum of its proper divisors (662107).

68186309 is a wasteful number, since it uses less digits than its factorization.

68186309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662106.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 68186309 is about 8257.5001665153. The cubic root of 68186309 is about 408.5379394236.

The spelling of 68186309 in words is "sixty-eight million, one hundred eighty-six thousand, three hundred nine".