85128005 has 8 divisors (see below), whose sum is σ = 102316824. Its totient is φ = 67993600.

The previous prime is 85127947. The next prime is 85128007. The reversal of 85128005 is 50082158.

It can be written as a sum of positive squares in 4 ways, for example, as 40157569 + 44970436 = 6337^2 + 6706^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85128005 - 2⁶ = 85127941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85128007) 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 7 ways as a sum of consecutive naturals, for example, 10076 + ... + 16485.

It is an arithmetic number, because the mean of its divisors is an integer number (12789603).

Almost surely, 2^85128005 is an apocalyptic number.

It is an amenable number.

85128005 is a deficient number, since it is larger than the sum of its proper divisors (17188819).

85128005 is a wasteful number, since it uses less digits than its factorization.

85128005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27207.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 85128005 is about 9226.4838914941. The cubic root of 85128005 is about 439.9035687435.

The spelling of 85128005 in words is "eighty-five million, one hundred twenty-eight thousand, five".