85787089 has 2 divisors, whose sum is σ = 85787090. Its totient is φ = 85787088.

The previous prime is 85787087. The next prime is 85787161. The reversal of 85787089 is 98078758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78854400 + 6932689 = 8880^2 + 2633^2 .

It is a cyclic number.

It is not a de Polignac number, because 85787089 - 2¹ = 85787087 is a prime.

Together with 85787087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85787081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42893544 + 42893545.

It is an arithmetic number, because the mean of its divisors is an integer number (42893545).

Almost surely, 2^85787089 is an apocalyptic number.

It is an amenable number.

85787089 is a deficient number, since it is larger than the sum of its proper divisors (1).

85787089 is an equidigital number, since it uses as much as digits as its factorization.

85787089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The square root of 85787089 is about 9262.1319899902. The cubic root of 85787089 is about 441.0359354581.

The spelling of 85787089 in words is "eighty-five million, seven hundred eighty-seven thousand, eighty-nine".