820544850 has 96 divisors (see below), whose sum is σ = 2339136000. Its totient is φ = 211256640.

The previous prime is 820544833. The next prime is 820544861. The reversal of 820544850 is 58445028.

820544850 is a `hidden beast` number, since 8 + 205 + 448 + 5 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28671 + ... + 49629.

It is an arithmetic number, because the mean of its divisors is an integer number (24366000).

Almost surely, 2^820544850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 820544850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1169568000).

820544850 is an abundant number, since it is smaller than the sum of its proper divisors (1518591150).

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

820544850 is a wasteful number, since it uses less digits than its factorization.

820544850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21009 (or 20998 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 820544850 is about 28645.1540404306. The cubic root of 820544850 is about 936.1974230176.

Adding to 820544850 its reverse (58445028), we get a palindrome (878989878).

The spelling of 820544850 in words is "eight hundred twenty million, five hundred forty-four thousand, eight hundred fifty".