68320281 has 16 divisors (see below), whose sum is σ = 97081344. Its totient is φ = 42637584.

The previous prime is 68320279. The next prime is 68320283. The reversal of 68320281 is 18202386.

It is an interprime number because it is at equal distance from previous prime (68320279) and next prime (68320283).

It is not a de Polignac number, because 68320281 - 2¹ = 68320279 is a prime.

It is a super-2 number, since 2×68320281² = 9335321591837922, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (68320283) 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 15 ways as a sum of consecutive naturals, for example, 7291 + ... + 13776.

It is an arithmetic number, because the mean of its divisors is an integer number (6067584).

Almost surely, 2^68320281 is an apocalyptic number.

It is an amenable number.

68320281 is a deficient number, since it is larger than the sum of its proper divisors (28761063).

68320281 is a wasteful number, since it uses less digits than its factorization.

68320281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21140.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 68320281 is about 8265.6083260701. The cubic root of 68320281 is about 408.8053285745.

The spelling of 68320281 in words is "sixty-eight million, three hundred twenty thousand, two hundred eighty-one".