68281817 has 4 divisors (see below), whose sum is σ = 68371380. Its totient is φ = 68192256.

The previous prime is 68281799. The next prime is 68281819. The reversal of 68281817 is 71818286.

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 12645136 + 55636681 = 3556^2 + 7459^2 .

It is a cyclic number.

It is not a de Polignac number, because 68281817 - 2²⁰ = 67233241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68281819) 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 3 ways as a sum of consecutive naturals, for example, 43628 + ... + 45165.

It is an arithmetic number, because the mean of its divisors is an integer number (17092845).

Almost surely, 2^68281817 is an apocalyptic number.

It is an amenable number.

68281817 is a deficient number, since it is larger than the sum of its proper divisors (89563).

68281817 is an equidigital number, since it uses as much as digits as its factorization.

68281817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89562.

The product of its digits is 43008, while the sum is 41.

The square root of 68281817 is about 8263.2812489955. The cubic root of 68281817 is about 408.7285956739.

The spelling of 68281817 in words is "sixty-eight million, two hundred eighty-one thousand, eight hundred seventeen".