815323216 has 20 divisors (see below), whose sum is σ = 1580305600. Its totient is φ = 407502432.

The previous prime is 815323151. The next prime is 815323259. The reversal of 815323216 is 612323518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39865 + ... + 56743.

It is an arithmetic number, because the mean of its divisors is an integer number (79015280).

Almost surely, 2^815323216 is an apocalyptic number.

It is an amenable number.

815323216 is a deficient number, since it is larger than the sum of its proper divisors (764982384).

815323216 is a wasteful number, since it uses less digits than its factorization.

815323216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19906 (or 19900 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 815323216 is about 28553.8651674340. The cubic root of 815323216 is about 934.2073280279.

It can be divided in two parts, 81532 and 3216, that added together give a palindrome (84748).

The spelling of 815323216 in words is "eight hundred fifteen million, three hundred twenty-three thousand, two hundred sixteen".