68658857 has 4 divisors (see below), whose sum is σ = 68695236. Its totient is φ = 68622480.

The previous prime is 68658839. The next prime is 68658881. The reversal of 68658857 is 75885686.

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 3759721 + 64899136 = 1939^2 + 8056^2 .

It is a cyclic number.

It is not a de Polignac number, because 68658857 - 2¹⁰ = 68657833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68658799 and 68658808.

It is not an unprimeable number, because it can be changed into a prime (68658817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15194 + ... + 19187.

It is an arithmetic number, because the mean of its divisors is an integer number (17173809).

Almost surely, 2^68658857 is an apocalyptic number.

It is an amenable number.

68658857 is a deficient number, since it is larger than the sum of its proper divisors (36379).

68658857 is a wasteful number, since it uses less digits than its factorization.

68658857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36378.

The product of its digits is 3225600, while the sum is 53.

The square root of 68658857 is about 8286.0640234070. The cubic root of 68658857 is about 409.4795239734.

The spelling of 68658857 in words is "sixty-eight million, six hundred fifty-eight thousand, eight hundred fifty-seven".