85489779 has 4 divisors (see below), whose sum is σ = 113986376. Its totient is φ = 56993184.

The previous prime is 85489777. The next prime is 85489799. The reversal of 85489779 is 97798458.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 85489779 - 2¹ = 85489777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85489777) 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 in 3 ways as a sum of consecutive naturals, for example, 14248294 + ... + 14248299.

It is an arithmetic number, because the mean of its divisors is an integer number (28496594).

Almost surely, 2^85489779 is an apocalyptic number.

85489779 is a deficient number, since it is larger than the sum of its proper divisors (28496597).

85489779 is a wasteful number, since it uses less digits than its factorization.

85489779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28496596.

The product of its digits is 5080320, while the sum is 57.

The square root of 85489779 is about 9246.0682995531. The cubic root of 85489779 is about 440.5258502929.

It can be divided in two parts, 85489 and 779, that added together give a palindrome (86268).

The spelling of 85489779 in words is "eighty-five million, four hundred eighty-nine thousand, seven hundred seventy-nine".