68512281 has 8 divisors (see below), whose sum is σ = 91464000. Its totient is φ = 45617712.

The previous prime is 68512243. The next prime is 68512303. The reversal of 68512281 is 18221586.

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

It is not a de Polignac number, because 68512281 - 2⁷ = 68512153 is a prime.

It is a super-2 number, since 2×68512281² = 9387865295645922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68512481) 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 7 ways as a sum of consecutive naturals, for example, 11406 + ... + 16343.

It is an arithmetic number, because the mean of its divisors is an integer number (11433000).

Almost surely, 2^68512281 is an apocalyptic number.

It is an amenable number.

68512281 is a deficient number, since it is larger than the sum of its proper divisors (22951719).

68512281 is a wasteful number, since it uses less digits than its factorization.

68512281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28575.

The product of its digits is 7680, while the sum is 33.

The square root of 68512281 is about 8277.2145677154. The cubic root of 68512281 is about 409.1879246319.

The spelling of 68512281 in words is "sixty-eight million, five hundred twelve thousand, two hundred eighty-one".