819128516 has 12 divisors (see below), whose sum is σ = 1433838588. Its totient is φ = 409460352.

The previous prime is 819128507. The next prime is 819128539. The reversal of 819128516 is 615821918.

It can be written as a sum of positive squares in 2 ways, for example, as 531486916 + 287641600 = 23054^2 + 16960^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6641 + ... + 41016.

It is an arithmetic number, because the mean of its divisors is an integer number (119486549).

Almost surely, 2^819128516 is an apocalyptic number.

It is an amenable number.

819128516 is a deficient number, since it is larger than the sum of its proper divisors (614710072).

819128516 is a wasteful number, since it uses less digits than its factorization.

819128516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51958 (or 51956 counting only the distinct ones).

The product of its digits is 34560, while the sum is 41.

The square root of 819128516 is about 28620.4213106656. The cubic root of 819128516 is about 935.6584592276.

The spelling of 819128516 in words is "eight hundred nineteen million, one hundred twenty-eight thousand, five hundred sixteen".