812227728 has 80 divisors (see below), whose sum is σ = 2279854080. Its totient is φ = 247683072.

The previous prime is 812227723. The next prime is 812227733. The reversal of 812227728 is 827722218.

It is an interprime number because it is at equal distance from previous prime (812227723) and next prime (812227733).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (812227723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64753 + ... + 76271.

It is an arithmetic number, because the mean of its divisors is an integer number (28498176).

Almost surely, 2^812227728 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 812227728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1139927040).

812227728 is an abundant number, since it is smaller than the sum of its proper divisors (1467626352).

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

812227728 is a wasteful number, since it uses less digits than its factorization.

812227728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656 (or 11650 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 812227728 is about 28499.6092604793. The cubic root of 812227728 is about 933.0235459411.

The spelling of 812227728 in words is "eight hundred twelve million, two hundred twenty-seven thousand, seven hundred twenty-eight".