812743020 has 72 divisors (see below), whose sum is σ = 2475280080. Its totient is φ = 215856000.

The previous prime is 812743013. The next prime is 812743037. The reversal of 812743020 is 20347218.

812743020 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 23 ways as a sum of consecutive naturals, for example, 36186 + ... + 54174.

It is an arithmetic number, because the mean of its divisors is an integer number (34378890).

Almost surely, 2^812743020 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 812743020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237640040).

812743020 is an abundant number, since it is smaller than the sum of its proper divisors (1662537060).

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

812743020 is a wasteful number, since it uses less digits than its factorization.

812743020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18255 (or 18250 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 812743020 is about 28508.6481615667. The cubic root of 812743020 is about 933.2208132495.

The spelling of 812743020 in words is "eight hundred twelve million, seven hundred forty-three thousand, twenty".