812819889847 has 32 divisors (see below), whose sum is σ = 982968209024. Its totient is φ = 657625651200.

The previous prime is 812819889841. The next prime is 812819889859. The reversal of 812819889847 is 748988918218.

It is not a de Polignac number, because 812819889847 - 2¹¹ = 812819887799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a self number, because there is not a number n which added to its sum of digits gives 812819889847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812819889841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 800947 + ... + 1505707.

It is an arithmetic number, because the mean of its divisors is an integer number (30717756532).

Almost surely, 2^812819889847 is an apocalyptic number.

812819889847 is a deficient number, since it is larger than the sum of its proper divisors (170148319177).

812819889847 is a wasteful number, since it uses less digits than its factorization.

812819889847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704939.

The product of its digits is 148635648, while the sum is 73.

The spelling of 812819889847 in words is "eight hundred twelve billion, eight hundred nineteen million, eight hundred eighty-nine thousand, eight hundred forty-seven".