85663220 has 24 divisors (see below), whose sum is σ = 180708864. Its totient is φ = 34109856.

The previous prime is 85663213. The next prime is 85663241. The reversal of 85663220 is 2236658.

It is a congruent number.

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, 5144 + ... + 14063.

It is an arithmetic number, because the mean of its divisors is an integer number (7529536).

Almost surely, 2^85663220 is an apocalyptic number.

It is an amenable number.

85663220 is an abundant number, since it is smaller than the sum of its proper divisors (95045644).

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

85663220 is a wasteful number, since it uses less digits than its factorization.

85663220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19439 (or 19437 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 85663220 is about 9255.4427230684. The cubic root of 85663220 is about 440.8235608611.

Adding to 85663220 its reverse (2236658), we get a palindrome (87899878).

The spelling of 85663220 in words is "eighty-five million, six hundred sixty-three thousand, two hundred twenty".