819020888136 has 128 divisors (see below), whose sum is σ = 2589789542400. Its totient is φ = 237397343040.

The previous prime is 819020888099. The next prime is 819020888137. The reversal of 819020888136 is 631888020918.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (819020888137) 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, 7438956 + ... + 7548251.

It is an arithmetic number, because the mean of its divisors is an integer number (20232730800).

Almost surely, 2^819020888136 is an apocalyptic number.

It is an amenable number.

819020888136 is an abundant number, since it is smaller than the sum of its proper divisors (1770768654264).

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

819020888136 is a wasteful number, since it uses less digits than its factorization.

819020888136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14987256 (or 14987246 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 819020888136 in words is "eight hundred nineteen billion, twenty million, eight hundred eighty-eight thousand, one hundred thirty-six".