85642128 has 120 divisors (see below), whose sum is σ = 281648640. Its totient is φ = 23950080.

The previous prime is 85642103. The next prime is 85642129. The reversal of 85642128 is 82124658.

85642128 is a `hidden beast` number, since 8 + 5 + 642 + 1 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 85642092 and 85642101.

It is not an unprimeable number, because it can be changed into a prime (85642129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18513 + ... + 22671.

It is an arithmetic number, because the mean of its divisors is an integer number (2347072).

Almost surely, 2^85642128 is an apocalyptic number.

85642128 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85642128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140824320).

85642128 is an abundant number, since it is smaller than the sum of its proper divisors (196006512).

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

85642128 is a wasteful number, since it uses less digits than its factorization.

85642128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197 (or 4188 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 85642128 is about 9254.3032152615. The cubic root of 85642128 is about 440.7873780289.

The spelling of 85642128 in words is "eighty-five million, six hundred forty-two thousand, one hundred twenty-eight".