816885538 has 32 divisors (see below), whose sum is σ = 1414315008. Its totient is φ = 346626000.

The previous prime is 816885533. The next prime is 816885541. The reversal of 816885538 is 835588618.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (816885533) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1037581 + ... + 1038367.

It is an arithmetic number, because the mean of its divisors is an integer number (44197344).

Almost surely, 2^816885538 is an apocalyptic number.

816885538 is a deficient number, since it is larger than the sum of its proper divisors (597429470).

816885538 is a wasteful number, since it uses less digits than its factorization.

816885538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438.

The product of its digits is 1843200, while the sum is 52.

The square root of 816885538 is about 28581.2095265403. The cubic root of 816885538 is about 934.8036565235.

The spelling of 816885538 in words is "eight hundred sixteen million, eight hundred eighty-five thousand, five hundred thirty-eight".