85128109 has 8 divisors (see below), whose sum is σ = 94043520. Its totient is φ = 76408800.

The previous prime is 85128097. The next prime is 85128119. The reversal of 85128109 is 90182158.

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

It is not a de Polignac number, because 85128109 - 2⁹ = 85127597 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 (85128119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48112 + ... + 49849.

It is an arithmetic number, because the mean of its divisors is an integer number (11755440).

Almost surely, 2^85128109 is an apocalyptic number.

It is an amenable number.

85128109 is a deficient number, since it is larger than the sum of its proper divisors (8915411).

85128109 is a wasteful number, since it uses less digits than its factorization.

85128109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98051.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 85128109 is about 9226.4895274422. The cubic root of 85128109 is about 439.9037478853.

The spelling of 85128109 in words is "eighty-five million, one hundred twenty-eight thousand, one hundred nine".