68399447 has 4 divisors (see below), whose sum is σ = 71373360. Its totient is φ = 65425536.

The previous prime is 68399431. The next prime is 68399473. The reversal of 68399447 is 74499386.

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

It is a cyclic number.

It is not a de Polignac number, because 68399447 - 2⁴ = 68399431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68399395 and 68399404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68399417) 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 in 3 ways as a sum of consecutive naturals, for example, 1486922 + ... + 1486967.

It is an arithmetic number, because the mean of its divisors is an integer number (17843340).

Almost surely, 2^68399447 is an apocalyptic number.

68399447 is a deficient number, since it is larger than the sum of its proper divisors (2973913).

68399447 is a wasteful number, since it uses less digits than its factorization.

68399447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973912.

The product of its digits is 1306368, while the sum is 50.

The square root of 68399447 is about 8270.3958188227. The cubic root of 68399447 is about 408.9631684322.

The spelling of 68399447 in words is "sixty-eight million, three hundred ninety-nine thousand, four hundred forty-seven".