812064647 has 4 divisors (see below), whose sum is σ = 812245896. Its totient is φ = 811883400.

The previous prime is 812064593. The next prime is 812064661. The reversal of 812064647 is 746460218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 812064647 - 2²⁴ = 795287431 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 812064647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812069647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83729 + ... + 92922.

It is an arithmetic number, because the mean of its divisors is an integer number (203061474).

Almost surely, 2^812064647 is an apocalyptic number.

812064647 is a deficient number, since it is larger than the sum of its proper divisors (181249).

812064647 is a wasteful number, since it uses less digits than its factorization.

812064647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181248.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 812064647 is about 28496.7480074481. The cubic root of 812064647 is about 932.9610968716.

The spelling of 812064647 in words is "eight hundred twelve million, sixty-four thousand, six hundred forty-seven".