85887779 has 2 divisors, whose sum is σ = 85887780. Its totient is φ = 85887778.

The previous prime is 85887751. The next prime is 85887787. The reversal of 85887779 is 97778858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85887779 - 2⁸ = 85887523 is a prime.

It is not a weakly prime, because it can be changed into another prime (85887709) 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, 42943889 + 42943890.

It is an arithmetic number, because the mean of its divisors is an integer number (42943890).

Almost surely, 2^85887779 is an apocalyptic number.

85887779 is a deficient number, since it is larger than the sum of its proper divisors (1).

85887779 is an equidigital number, since it uses as much as digits as its factorization.

85887779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 59.

The square root of 85887779 is about 9267.5659695521. The cubic root of 85887779 is about 441.2084188548.

The spelling of 85887779 in words is "eighty-five million, eight hundred eighty-seven thousand, seven hundred seventy-nine".