85634220 has 96 divisors (see below), whose sum is σ = 279272448. Its totient is φ = 19199232.

The previous prime is 85634203. The next prime is 85634233. The reversal of 85634220 is 2243658.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 20337 + ... + 24183.

It is an arithmetic number, because the mean of its divisors is an integer number (2909088).

Almost surely, 2^85634220 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 85634220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139636224).

85634220 is an abundant number, since it is smaller than the sum of its proper divisors (193638228).

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

85634220 is a wasteful number, since it uses less digits than its factorization.

85634220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919 (or 3917 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 85634220 is about 9253.8759447055. The cubic root of 85634220 is about 440.7738105088.

Adding to 85634220 its reverse (2243658), we get a palindrome (87877878).

The spelling of 85634220 in words is "eighty-five million, six hundred thirty-four thousand, two hundred twenty".