812145728 has 28 divisors (see below), whose sum is σ = 1696425360. Its totient is φ = 384700032.

The previous prime is 812145713. The next prime is 812145757. The reversal of 812145728 is 827541218.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 812145691 and 812145700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332726 + ... + 335157.

It is an arithmetic number, because the mean of its divisors is an integer number (60586620).

Almost surely, 2^812145728 is an apocalyptic number.

It is an amenable number.

812145728 is an abundant number, since it is smaller than the sum of its proper divisors (884279632).

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

812145728 is a wasteful number, since it uses less digits than its factorization.

812145728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667914 (or 667904 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 812145728 is about 28498.1706079531. The cubic root of 812145728 is about 932.9921464937.

The spelling of 812145728 in words is "eight hundred twelve million, one hundred forty-five thousand, seven hundred twenty-eight".