68109281 has 8 divisors (see below), whose sum is σ = 72330720. Its totient is φ = 63951552.

The previous prime is 68109271. The next prime is 68109289. The reversal of 68109281 is 18290186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68109281 - 2¹⁸ = 67847137 is a prime.

It is a super-2 number, since 2×68109281² = 9277748316673922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68109289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13715 + ... + 18008.

It is an arithmetic number, because the mean of its divisors is an integer number (9041340).

Almost surely, 2^68109281 is an apocalyptic number.

It is an amenable number.

68109281 is a deficient number, since it is larger than the sum of its proper divisors (4221439).

68109281 is a wasteful number, since it uses less digits than its factorization.

68109281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31855.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 68109281 is about 8252.8347251111. The cubic root of 68109281 is about 408.3840438293.

The spelling of 68109281 in words is "sixty-eight million, one hundred nine thousand, two hundred eighty-one".