68735809 has 2 divisors, whose sum is σ = 68735810. Its totient is φ = 68735808.

The previous prime is 68735789. The next prime is 68735813. The reversal of 68735809 is 90853786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 20502784 = 6945^2 + 4528^2 .

It is a cyclic number.

It is not a de Polignac number, because 68735809 - 2⁹ = 68735297 is a prime.

It is a super-2 number, since 2×68735809² = 9449222877768962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68735209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34367904 + 34367905.

It is an arithmetic number, because the mean of its divisors is an integer number (34367905).

Almost surely, 2^68735809 is an apocalyptic number.

It is an amenable number.

68735809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68735809 is an equidigital number, since it uses as much as digits as its factorization.

68735809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 68735809 is about 8290.7061822260. The cubic root of 68735809 is about 409.6324467228.

The spelling of 68735809 in words is "sixty-eight million, seven hundred thirty-five thousand, eight hundred nine".