68218257 has 16 divisors (see below), whose sum is σ = 92292480. Its totient is φ = 44815872.

The previous prime is 68218243. The next prime is 68218273. The reversal of 68218257 is 75281286.

It is not a de Polignac number, because 68218257 - 2¹¹ = 68216209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68218277) 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 15 ways as a sum of consecutive naturals, for example, 104143 + ... + 104795.

It is an arithmetic number, because the mean of its divisors is an integer number (5768280).

Almost surely, 2^68218257 is an apocalyptic number.

It is an amenable number.

68218257 is a deficient number, since it is larger than the sum of its proper divisors (24074223).

68218257 is a wasteful number, since it uses less digits than its factorization.

68218257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its digits is 53760, while the sum is 39.

The square root of 68218257 is about 8259.4344237363. The cubic root of 68218257 is about 408.6017348901.

The spelling of 68218257 in words is "sixty-eight million, two hundred eighteen thousand, two hundred fifty-seven".