68197709 has 4 divisors (see below), whose sum is σ = 68688480. Its totient is φ = 67706940.

The previous prime is 68197681. The next prime is 68197721. The reversal of 68197709 is 90779186.

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.

It is a cyclic number.

It is not a de Polignac number, because 68197709 - 2²⁴ = 51420493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68197729) by changing a digit.

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, 245177 + ... + 245454.

It is an arithmetic number, because the mean of its divisors is an integer number (17172120).

Almost surely, 2^68197709 is an apocalyptic number.

It is an amenable number.

68197709 is a deficient number, since it is larger than the sum of its proper divisors (490771).

68197709 is a wasteful number, since it uses less digits than its factorization.

68197709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490770.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 68197709 is about 8258.1904192141. The cubic root of 68197709 is about 408.5607058365.

The spelling of 68197709 in words is "sixty-eight million, one hundred ninety-seven thousand, seven hundred nine".