820860084 has 72 divisors (see below), whose sum is σ = 2272233600. Its totient is φ = 247795200.

The previous prime is 820860071. The next prime is 820860149. The reversal of 820860084 is 480068028.

820860084 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×820860084² = 1347622555008974112, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103492 + ... + 111140.

It is an arithmetic number, because the mean of its divisors is an integer number (31558800).

Almost surely, 2^820860084 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 820860084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136116800).

820860084 is an abundant number, since it is smaller than the sum of its proper divisors (1451373516).

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

820860084 is a wasteful number, since it uses less digits than its factorization.

820860084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7941 (or 7936 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 820860084 is about 28650.6559087222. The cubic root of 820860084 is about 936.3172959994.

The spelling of 820860084 in words is "eight hundred twenty million, eight hundred sixty thousand, eighty-four".