812863343820 has 96 divisors (see below), whose sum is σ = 2484693066240. Its totient is φ = 196917698560.

The previous prime is 812863343801. The next prime is 812863343927. The reversal of 812863343820 is 28343368218.

It is a happy number.

812863343820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 812863343820.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 492889 + ... + 1366991.

It is an arithmetic number, because the mean of its divisors is an integer number (25882219440).

Almost surely, 2^812863343820 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 812863343820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242346533120).

812863343820 is an abundant number, since it is smaller than the sum of its proper divisors (1671829722420).

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

812863343820 is a wasteful number, since it uses less digits than its factorization.

812863343820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875535 (or 875533 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 812863343820 in words is "eight hundred twelve billion, eight hundred sixty-three million, three hundred forty-three thousand, eight hundred twenty".