816820284812 has 48 divisors (see below), whose sum is σ = 1671104590848. Its totient is φ = 342061991040.

The previous prime is 816820284751. The next prime is 816820284827. The reversal of 816820284812 is 218482028618.

816820284812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308987 + ... + 1314957.

It is an arithmetic number, because the mean of its divisors is an integer number (34814678976).

Almost surely, 2^816820284812 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 816820284812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835552295424).

816820284812 is an abundant number, since it is smaller than the sum of its proper divisors (854284306036).

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

816820284812 is a wasteful number, since it uses less digits than its factorization.

816820284812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006646 (or 1006644 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 50.

The spelling of 816820284812 in words is "eight hundred sixteen billion, eight hundred twenty million, two hundred eighty-four thousand, eight hundred twelve".