68888857 has 4 divisors (see below), whose sum is σ = 70750756. Its totient is φ = 67026960.

The previous prime is 68888849. The next prime is 68888861. The reversal of 68888857 is 75888886.

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 52070656 + 16818201 = 7216^2 + 4101^2 .

It is a cyclic number.

It is not a de Polignac number, because 68888857 - 2³ = 68888849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68888867) 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 3 ways as a sum of consecutive naturals, for example, 930894 + ... + 930967.

It is an arithmetic number, because the mean of its divisors is an integer number (17687689).

Almost surely, 2^68888857 is an apocalyptic number.

It is an amenable number.

68888857 is a deficient number, since it is larger than the sum of its proper divisors (1861899).

68888857 is a wasteful number, since it uses less digits than its factorization.

68888857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861898.

The product of its digits is 6881280, while the sum is 58.

The square root of 68888857 is about 8299.9311442927. The cubic root of 68888857 is about 409.9362522344.

The spelling of 68888857 in words is "sixty-eight million, eight hundred eighty-eight thousand, eight hundred fifty-seven".