75840217 has 2 divisors, whose sum is σ = 75840218. Its totient is φ = 75840216.

The previous prime is 75840199. The next prime is 75840221. The reversal of 75840217 is 71204857.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74718736 + 1121481 = 8644^2 + 1059^2 .

It is a cyclic number.

It is not a de Polignac number, because 75840217 - 2²³ = 67451609 is a prime.

It is not a weakly prime, because it can be changed into another prime (75840227) 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, 37920108 + 37920109.

It is an arithmetic number, because the mean of its divisors is an integer number (37920109).

Almost surely, 2^75840217 is an apocalyptic number.

It is an amenable number.

75840217 is a deficient number, since it is larger than the sum of its proper divisors (1).

75840217 is an equidigital number, since it uses as much as digits as its factorization.

75840217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 75840217 is about 8708.6288817471. The cubic root of 75840217 is about 423.2853025191.

The spelling of 75840217 in words is "seventy-five million, eight hundred forty thousand, two hundred seventeen".