812843664 has 20 divisors (see below), whose sum is σ = 2099846256. Its totient is φ = 270947872.

The previous prime is 812843533. The next prime is 812843687. The reversal of 812843664 is 466348218.

It is a nude number because it is divisible by every one of its digits.

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, 8467074 + ... + 8467169.

Almost surely, 2^812843664 is an apocalyptic number.

It is an amenable number.

812843664 is an abundant number, since it is smaller than the sum of its proper divisors (1287002592).

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

812843664 is a wasteful number, since it uses less digits than its factorization.

812843664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16934254 (or 16934248 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 812843664 is about 28510.4132555107. The cubic root of 812843664 is about 933.2593326817.

It can be divided in two parts, 81284 and 3664, that added together give a palindrome (84948).

The spelling of 812843664 in words is "eight hundred twelve million, eight hundred forty-three thousand, six hundred sixty-four".