85807769 has 2 divisors, whose sum is σ = 85807770. Its totient is φ = 85807768.

The previous prime is 85807763. The next prime is 85807817. The reversal of 85807769 is 96770858.

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., 83814025 + 1993744 = 9155^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 85807769 - 2⁴ = 85807753 is a prime.

It is a super-2 number, since 2×85807769² = 14725946441514722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85807763) 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, 42903884 + 42903885.

It is an arithmetic number, because the mean of its divisors is an integer number (42903885).

Almost surely, 2^85807769 is an apocalyptic number.

It is an amenable number.

85807769 is a deficient number, since it is larger than the sum of its proper divisors (1).

85807769 is an equidigital number, since it uses as much as digits as its factorization.

85807769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 85807769 is about 9263.2482963591. The cubic root of 85807769 is about 441.0713716000.

The spelling of 85807769 in words is "eighty-five million, eight hundred seven thousand, seven hundred sixty-nine".