68684321 has 4 divisors (see below), whose sum is σ = 70540692. Its totient is φ = 66827952.

The previous prime is 68684309. The next prime is 68684323. The reversal of 68684321 is 12348686.

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 64320400 + 4363921 = 8020^2 + 2089^2 .

It is a cyclic number.

It is not a de Polignac number, because 68684321 - 2⁶ = 68684257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68684323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928130 + ... + 928203.

It is an arithmetic number, because the mean of its divisors is an integer number (17635173).

Almost surely, 2^68684321 is an apocalyptic number.

It is an amenable number.

68684321 is a deficient number, since it is larger than the sum of its proper divisors (1856371).

68684321 is a wasteful number, since it uses less digits than its factorization.

68684321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856370.

The product of its digits is 55296, while the sum is 38.

The square root of 68684321 is about 8287.6004367971. The cubic root of 68684321 is about 409.5301399137.

The spelling of 68684321 in words is "sixty-eight million, six hundred eighty-four thousand, three hundred twenty-one".