819791864 has 16 divisors (see below), whose sum is σ = 1545160320. Its totient is φ = 407749120.

The previous prime is 819791849. The next prime is 819791887. The reversal of 819791864 is 468197918.

It is a congruent number.

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, 266729 + ... + 269784.

It is an arithmetic number, because the mean of its divisors is an integer number (96572520).

Almost surely, 2^819791864 is an apocalyptic number.

It is an amenable number.

819791864 is a deficient number, since it is larger than the sum of its proper divisors (725368456).

819791864 is a wasteful number, since it uses less digits than its factorization.

819791864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536710 (or 536706 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 819791864 is about 28632.0076837095. The cubic root of 819791864 is about 935.9109632354.

The spelling of 819791864 in words is "eight hundred nineteen million, seven hundred ninety-one thousand, eight hundred sixty-four".