85128773 has 4 divisors (see below), whose sum is σ = 88830048. Its totient is φ = 81427500.

The previous prime is 85128763. The next prime is 85128803. The reversal of 85128773 is 37782158.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37782158 = 2 ⋅18891079.

It is a cyclic number.

It is not a de Polignac number, because 85128773 - 2¹⁴ = 85112389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85128773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85128713) 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, 1850603 + ... + 1850648.

It is an arithmetic number, because the mean of its divisors is an integer number (22207512).

Almost surely, 2^85128773 is an apocalyptic number.

It is an amenable number.

85128773 is a deficient number, since it is larger than the sum of its proper divisors (3701275).

85128773 is a wasteful number, since it uses less digits than its factorization.

85128773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701274.

The product of its digits is 94080, while the sum is 41.

The square root of 85128773 is about 9226.5255107218. The cubic root of 85128773 is about 439.9048916334.

The spelling of 85128773 in words is "eighty-five million, one hundred twenty-eight thousand, seven hundred seventy-three".