819888012 has 36 divisors (see below), whose sum is σ = 2074985640. Its totient is φ = 272967552.

The previous prime is 819888011. The next prime is 819888067. The reversal of 819888012 is 210888918.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (819888011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17668 + ... + 44180.

It is an arithmetic number, because the mean of its divisors is an integer number (57638490).

Almost surely, 2^819888012 is an apocalyptic number.

It is an amenable number.

819888012 is an abundant number, since it is smaller than the sum of its proper divisors (1255097628).

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

819888012 is a wasteful number, since it uses less digits than its factorization.

819888012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27382 (or 27377 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The square root of 819888012 is about 28633.6866644866. The cubic root of 819888012 is about 935.9475507538.

It can be divided in two parts, 81988 and 8012, that added together give a square (90000 = 300²).

The spelling of 819888012 in words is "eight hundred nineteen million, eight hundred eighty-eight thousand, twelve".