68857861 has 8 divisors (see below), whose sum is σ = 71940600. Its totient is φ = 65822400.

The previous prime is 68857847. The next prime is 68857889. The reversal of 68857861 is 16875886.

It can be written as a sum of positive squares in 4 ways, for example, as 50324836 + 18533025 = 7094^2 + 4305^2 .

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-68857861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68857801) 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, 8826 + ... + 14683.

It is an arithmetic number, because the mean of its divisors is an integer number (8992575).

Almost surely, 2^68857861 is an apocalyptic number.

It is an amenable number.

68857861 is a deficient number, since it is larger than the sum of its proper divisors (3082739).

68857861 is a wasteful number, since it uses less digits than its factorization.

68857861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23639.

The product of its digits is 645120, while the sum is 49.

The square root of 68857861 is about 8298.0636898014. The cubic root of 68857861 is about 409.8747604789.

The spelling of 68857861 in words is "sixty-eight million, eight hundred fifty-seven thousand, eight hundred sixty-one".