68668281 has 12 divisors (see below), whose sum is σ = 108204720. Its totient is φ = 41617080.

The previous prime is 68668279. The next prime is 68668283. The reversal of 68668281 is 18286686.

It is an interprime number because it is at equal distance from previous prime (68668279) and next prime (68668283).

It is not a de Polignac number, because 68668281 - 2¹ = 68668279 is a prime.

It is a super-2 number, since 2×68668281² = 9430665630989922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68668283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346711 + ... + 346908.

It is an arithmetic number, because the mean of its divisors is an integer number (9017060).

Almost surely, 2^68668281 is an apocalyptic number.

It is an amenable number.

68668281 is a deficient number, since it is larger than the sum of its proper divisors (39536439).

68668281 is a wasteful number, since it uses less digits than its factorization.

68668281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693636 (or 693633 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 68668281 is about 8286.6326695468. The cubic root of 68668281 is about 409.4982579414.

The spelling of 68668281 in words is "sixty-eight million, six hundred sixty-eight thousand, two hundred eighty-one".