68328821 has 6 divisors (see below), whose sum is σ = 75105366. Its totient is φ = 62117000.

The previous prime is 68328781. The next prime is 68328857. The reversal of 68328821 is 12882386.

It can be written as a sum of positive squares in only one way, i.e., 39866596 + 28462225 = 6314^2 + 5335^2 .

It is not a de Polignac number, because 68328821 - 2¹⁰ = 68327797 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 (68328121) 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 5 ways as a sum of consecutive naturals, for example, 282230 + ... + 282471.

It is an arithmetic number, because the mean of its divisors is an integer number (12517561).

Almost surely, 2^68328821 is an apocalyptic number.

It is an amenable number.

68328821 is a deficient number, since it is larger than the sum of its proper divisors (6776545).

68328821 is a wasteful number, since it uses less digits than its factorization.

68328821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564723 (or 564712 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 68328821 is about 8266.1249083231. The cubic root of 68328821 is about 408.8223613501.

The spelling of 68328821 in words is "sixty-eight million, three hundred twenty-eight thousand, eight hundred twenty-one".