68857 has 4 divisors (see below), whose sum is σ = 70756. Its totient is φ = 66960.

The previous prime is 68821. The next prime is 68863. The reversal of 68857 is 75886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24336 + 44521 = 156^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 68857 - 2⁷ = 68729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894 + ... + 967.

It is an arithmetic number, because the mean of its divisors is an integer number (17689).

2⁶⁸⁸⁵⁷ is an apocalyptic number.

68857 is the 152-nd hex number.

It is an amenable number.

68857 is a deficient number, since it is larger than the sum of its proper divisors (1899).

68857 is a wasteful number, since it uses less digits than its factorization.

68857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898.

The product of its digits is 13440, while the sum is 34.

The square root of 68857 is about 262.4061737079. The cubic root of 68857 is about 40.9873052111.

The spelling of 68857 in words is "sixty-eight thousand, eight hundred fifty-seven".