68756861 has 8 divisors (see below), whose sum is σ = 70227000. Its totient is φ = 67302400.

The previous prime is 68756851. The next prime is 68756881. The reversal of 68756861 is 16865786.

68756861 = 480² + 481² + ... + 681².

It can be written as a sum of positive squares in 4 ways, for example, as 3648100 + 65108761 = 1910^2 + 8069^2 .

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-68756861 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 (68756851) 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 7 ways as a sum of consecutive naturals, for example, 5165 + ... + 12813.

It is an arithmetic number, because the mean of its divisors is an integer number (8778375).

Almost surely, 2^68756861 is an apocalyptic number.

It is an amenable number.

68756861 is a deficient number, since it is larger than the sum of its proper divisors (1470139).

68756861 is a wasteful number, since it uses less digits than its factorization.

68756861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7839.

The product of its digits is 483840, while the sum is 47.

The square root of 68756861 is about 8291.9756994338. The cubic root of 68756861 is about 409.6742623943.

The spelling of 68756861 in words is "sixty-eight million, seven hundred fifty-six thousand, eight hundred sixty-one".