812947663 has 8 divisors (see below), whose sum is σ = 888877440. Its totient is φ = 737355480.

The previous prime is 812947643. The next prime is 812947669. The reversal of 812947663 is 366749218.

812947663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812947663 - 2⁹ = 812947151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812947669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79345 + ... + 89002.

It is an arithmetic number, because the mean of its divisors is an integer number (111109680).

Almost surely, 2^812947663 is an apocalyptic number.

812947663 is a deficient number, since it is larger than the sum of its proper divisors (75929777).

812947663 is a wasteful number, since it uses less digits than its factorization.

812947663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168797.

The product of its digits is 435456, while the sum is 46.

The square root of 812947663 is about 28512.2370746317. The cubic root of 812947663 is about 933.2991328313.

The spelling of 812947663 in words is "eight hundred twelve million, nine hundred forty-seven thousand, six hundred sixty-three".