85128205 has 4 divisors (see below), whose sum is σ = 102153852. Its totient is φ = 68102560.

The previous prime is 85128191. The next prime is 85128269. The reversal of 85128205 is 50282158.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62821476 + 22306729 = 7926^2 + 4723^2 .

It is a de Polignac number, because none of the positive numbers 2^k-85128205 is a prime.

It is a super-2 number, since 2×85128205² = 14493622573044050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

85128205 is a modest number, since divided by 128205 gives 85 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8512816 + ... + 8512825.

It is an arithmetic number, because the mean of its divisors is an integer number (25538463).

Almost surely, 2^85128205 is an apocalyptic number.

It is an amenable number.

85128205 is a deficient number, since it is larger than the sum of its proper divisors (17025647).

85128205 is a wasteful number, since it uses less digits than its factorization.

85128205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17025646.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 85128205 is about 9226.4947298527. The cubic root of 85128205 is about 439.9039132469.

The spelling of 85128205 in words is "eighty-five million, one hundred twenty-eight thousand, two hundred five".