85821228 has 24 divisors (see below), whose sum is σ = 222499760. Its totient is φ = 28607040.

The previous prime is 85821221. The next prime is 85821251. The reversal of 85821228 is 82212858.

It is a happy number.

It is a super-3 number, since 3×85821228³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 = 85821192 and 85821201.

It is not an unprimeable number, because it can be changed into a prime (85821221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397213 + ... + 397428.

Almost surely, 2^85821228 is an apocalyptic number.

It is an amenable number.

85821228 is an abundant number, since it is smaller than the sum of its proper divisors (136678532).

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

85821228 is a wasteful number, since it uses less digits than its factorization.

85821228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794654 (or 794646 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 85821228 is about 9263.9747408982. The cubic root of 85821228 is about 441.0944311640.

The spelling of 85821228 in words is "eighty-five million, eight hundred twenty-one thousand, two hundred twenty-eight".