68816257 has 8 divisors (see below), whose sum is σ = 69689984. Its totient is φ = 67946688.

The previous prime is 68816227. The next prime is 68816281. The reversal of 68816257 is 75261886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68816257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68816227) 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, 43828 + ... + 45370.

It is an arithmetic number, because the mean of its divisors is an integer number (8711248).

Almost surely, 2^68816257 is an apocalyptic number.

It is an amenable number.

68816257 is a deficient number, since it is larger than the sum of its proper divisors (873727).

68816257 is a wasteful number, since it uses less digits than its factorization.

68816257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079.

The product of its digits is 161280, while the sum is 43.

The square root of 68816257 is about 8295.5564611423. The cubic root of 68816257 is about 409.7921949116.

The spelling of 68816257 in words is "sixty-eight million, eight hundred sixteen thousand, two hundred fifty-seven".