816520818 has 8 divisors (see below), whose sum is σ = 1633041648. Its totient is φ = 272173604.

The previous prime is 816520777. The next prime is 816520819. The reversal of 816520818 is 818025618.

816520818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

816520818 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (816520819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68043396 + ... + 68043407.

It is an arithmetic number, because the mean of its divisors is an integer number (204130206).

Almost surely, 2^816520818 is an apocalyptic number.

816520818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

816520818 is a wasteful number, since it uses less digits than its factorization.

816520818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136086808.

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 816520818 is about 28574.8283984349. The cubic root of 816520818 is about 934.6645132665.

The spelling of 816520818 in words is "eight hundred sixteen million, five hundred twenty thousand, eight hundred eighteen".