85727777 has 2 divisors, whose sum is σ = 85727778. Its totient is φ = 85727776.

The previous prime is 85727771. The next prime is 85727801. The reversal of 85727777 is 77772758.

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., 82283041 + 3444736 = 9071^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 85727777 - 2¹⁴ = 85711393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85727771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42863888 + 42863889.

It is an arithmetic number, because the mean of its divisors is an integer number (42863889).

Almost surely, 2^85727777 is an apocalyptic number.

It is an amenable number.

85727777 is a deficient number, since it is larger than the sum of its proper divisors (1).

85727777 is an equidigital number, since it uses as much as digits as its factorization.

85727777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344560, while the sum is 50.

The square root of 85727777 is about 9258.9295817605. The cubic root of 85727777 is about 440.9342699876.

The spelling of 85727777 in words is "eighty-five million, seven hundred twenty-seven thousand, seven hundred seventy-seven".