85128870 has 16 divisors (see below), whose sum is σ = 204309360. Its totient is φ = 22701024.

The previous prime is 85128829. The next prime is 85128887. The reversal of 85128870 is 7882158.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1418785 + ... + 1418844.

It is an arithmetic number, because the mean of its divisors is an integer number (12769335).

Almost surely, 2^85128870 is an apocalyptic number.

85128870 is an abundant number, since it is smaller than the sum of its proper divisors (119180490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85128870 is a wasteful number, since it uses less digits than its factorization.

85128870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837639.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 85128870 is about 9226.5307673036. The cubic root of 85128870 is about 439.9050587166.

The spelling of 85128870 in words is "eighty-five million, one hundred twenty-eight thousand, eight hundred seventy".