68640193 has 2 divisors, whose sum is σ = 68640194. Its totient is φ = 68640192.

The previous prime is 68640157. The next prime is 68640233. The reversal of 68640193 is 39104686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42354064 + 26286129 = 6508^2 + 5127^2 .

It is a cyclic number.

It is not a de Polignac number, because 68640193 - 2¹⁷ = 68509121 is a prime.

It is a super-2 number, since 2×68640193² = 9422952190154498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68640133) 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 as a sum of consecutive naturals, namely, 34320096 + 34320097.

It is an arithmetic number, because the mean of its divisors is an integer number (34320097).

Almost surely, 2^68640193 is an apocalyptic number.

It is an amenable number.

68640193 is a deficient number, since it is larger than the sum of its proper divisors (1).

68640193 is an equidigital number, since it uses as much as digits as its factorization.

68640193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 68640193 is about 8284.9377185348. The cubic root of 68640193 is about 409.4424167509.

The spelling of 68640193 in words is "sixty-eight million, six hundred forty thousand, one hundred ninety-three".