816520446 has 64 divisors (see below), whose sum is σ = 2076802560. Its totient is φ = 232943040.

The previous prime is 816520429. The next prime is 816520457. The reversal of 816520446 is 644025618.

It is a self number, because there is not a number n which added to its sum of digits gives 816520446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356826 + ... + 359106.

It is an arithmetic number, because the mean of its divisors is an integer number (32450040).

Almost surely, 2^816520446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816520446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038401280).

816520446 is an abundant number, since it is smaller than the sum of its proper divisors (1260282114).

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

816520446 is a wasteful number, since it uses less digits than its factorization.

816520446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246 (or 3240 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 816520446 is about 28574.8218892087. The cubic root of 816520446 is about 934.6643713247.

The spelling of 816520446 in words is "eight hundred sixteen million, five hundred twenty thousand, four hundred forty-six".