68543689 has 4 divisors (see below), whose sum is σ = 68622724. Its totient is φ = 68464656.

The previous prime is 68543633. The next prime is 68543693. The reversal of 68543689 is 98634586.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23425600 + 45118089 = 4840^2 + 6717^2 .

It is a cyclic number.

It is not a de Polignac number, because 68543689 - 2⁹ = 68543177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68543989) 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, 38202 + ... + 39955.

It is an arithmetic number, because the mean of its divisors is an integer number (17155681).

Almost surely, 2^68543689 is an apocalyptic number.

It is an amenable number.

68543689 is a deficient number, since it is larger than the sum of its proper divisors (79035).

68543689 is an equidigital number, since it uses as much as digits as its factorization.

68543689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79034.

The product of its digits is 1244160, while the sum is 49.

The square root of 68543689 is about 8279.1116069298. Note that the first 3 decimals coincide. The cubic root of 68543689 is about 409.2504429171.

The spelling of 68543689 in words is "sixty-eight million, five hundred forty-three thousand, six hundred eighty-nine".