85421128 has 32 divisors (see below), whose sum is σ = 173577600. Its totient is φ = 39175488.

The previous prime is 85421117. The next prime is 85421159. The reversal of 85421128 is 82112458.

It is a self number, because there is not a number n which added to its sum of digits gives 85421128.

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, 14433 + ... + 19471.

It is an arithmetic number, because the mean of its divisors is an integer number (5424300).

Almost surely, 2^85421128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85421128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86788800).

85421128 is an abundant number, since it is smaller than the sum of its proper divisors (88156472).

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

85421128 is a wasteful number, since it uses less digits than its factorization.

85421128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221 (or 5217 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 85421128 is about 9242.3551111175. The cubic root of 85421128 is about 440.4078999783.

The spelling of 85421128 in words is "eighty-five million, four hundred twenty-one thousand, one hundred twenty-eight".