68857751 has 2 divisors, whose sum is σ = 68857752. Its totient is φ = 68857750.

The previous prime is 68857739. The next prime is 68857757. The reversal of 68857751 is 15775886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68857751 - 2¹⁰ = 68856727 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68857696 and 68857705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68857757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34428875 + 34428876.

It is an arithmetic number, because the mean of its divisors is an integer number (34428876).

Almost surely, 2^68857751 is an apocalyptic number.

68857751 is a deficient number, since it is larger than the sum of its proper divisors (1).

68857751 is an equidigital number, since it uses as much as digits as its factorization.

68857751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 47.

The square root of 68857751 is about 8298.0570617464. The cubic root of 68857751 is about 409.8745422213.

The spelling of 68857751 in words is "sixty-eight million, eight hundred fifty-seven thousand, seven hundred fifty-one".