85128828 has 12 divisors (see below), whose sum is σ = 198633960. Its totient is φ = 28376272.

The previous prime is 85128811. The next prime is 85128829. The reversal of 85128828 is 82882158.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 85128828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85128829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3547023 + ... + 3547046.

It is an arithmetic number, because the mean of its divisors is an integer number (16552830).

Almost surely, 2^85128828 is an apocalyptic number.

It is an amenable number.

85128828 is an abundant number, since it is smaller than the sum of its proper divisors (113505132).

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

85128828 is a wasteful number, since it uses less digits than its factorization.

85128828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094076 (or 7094074 counting only the distinct ones).

The product of its digits is 81920, while the sum is 42.

The square root of 85128828 is about 9226.5284912582. The cubic root of 85128828 is about 439.9049863713.

The spelling of 85128828 in words is "eighty-five million, one hundred twenty-eight thousand, eight hundred twenty-eight".