819705986836 has 96 divisors (see below), whose sum is σ = 1695268673280. Its totient is φ = 342876441600.

The previous prime is 819705986831. The next prime is 819705986839. The reversal of 819705986836 is 638689507918.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819705986831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8197090 + ... + 8296486.

It is an arithmetic number, because the mean of its divisors is an integer number (17659048680).

Almost surely, 2^819705986836 is an apocalyptic number.

It is an amenable number.

819705986836 is an abundant number, since it is smaller than the sum of its proper divisors (875562686444).

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

819705986836 is a wasteful number, since it uses less digits than its factorization.

819705986836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99745 (or 99743 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 70.

The spelling of 819705986836 in words is "eight hundred nineteen billion, seven hundred five million, nine hundred eighty-six thousand, eight hundred thirty-six".