812707218 has 24 divisors (see below), whose sum is σ = 1761632028. Its totient is φ = 270784512.

The previous prime is 812707213. The next prime is 812707237.

It is a happy number.

812707218 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 800154369 + 12552849 = 28287^2 + 3543^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (812707211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39330 + ... + 56322.

Almost surely, 2^812707218 is an apocalyptic number.

812707218 is an abundant number, since it is smaller than the sum of its proper divisors (948924810).

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

812707218 is a wasteful number, since it uses less digits than its factorization.

812707218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19658 (or 19655 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 812707218 is about 28508.0202399255. The cubic root of 812707218 is about 933.2071099996.

It can be divided in two parts, 81270 and 7218, that added together give a palindrome (88488).

The spelling of 812707218 in words is "eight hundred twelve million, seven hundred seven thousand, two hundred eighteen".