812810538 has 40 divisors (see below), whose sum is σ = 1917162720. Its totient is φ = 256676040.

The previous prime is 812810533. The next prime is 812810549. The reversal of 812810538 is 835018218.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (812810533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 128958 + ... + 135113.

It is an arithmetic number, because the mean of its divisors is an integer number (47929068).

Almost surely, 2^812810538 is an apocalyptic number.

812810538 is an abundant number, since it is smaller than the sum of its proper divisors (1104352182).

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

812810538 is a wasteful number, since it uses less digits than its factorization.

812810538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264104 (or 264095 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 812810538 is about 28509.8323039614. The cubic root of 812810538 is about 933.2466547339.

The spelling of 812810538 in words is "eight hundred twelve million, eight hundred ten thousand, five hundred thirty-eight".