68243057 has 2 divisors, whose sum is σ = 68243058. Its totient is φ = 68243056.

The previous prime is 68243053. The next prime is 68243099. The reversal of 68243057 is 75034286.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58232161 + 10010896 = 7631^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 68243057 - 2² = 68243053 is a prime.

It is a super-2 number, since 2×68243057² = 9314229657410498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68243053) 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 as a sum of consecutive naturals, namely, 34121528 + 34121529.

It is an arithmetic number, because the mean of its divisors is an integer number (34121529).

Almost surely, 2^68243057 is an apocalyptic number.

It is an amenable number.

68243057 is a deficient number, since it is larger than the sum of its proper divisors (1).

68243057 is an equidigital number, since it uses as much as digits as its factorization.

68243057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 68243057 is about 8260.9356007658. The cubic root of 68243057 is about 408.6512431193.

The spelling of 68243057 in words is "sixty-eight million, two hundred forty-three thousand, fifty-seven".