816664328 has 8 divisors (see below), whose sum is σ = 1531245630. Its totient is φ = 408332160.

The previous prime is 816664291. The next prime is 816664369. The reversal of 816664328 is 823466618.

It can be written as a sum of positive squares in only one way, i.e., 647091844 + 169572484 = 25438^2 + 13022^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 51041513 + ... + 51041528.

Almost surely, 2^816664328 is an apocalyptic number.

It is an amenable number.

816664328 is a deficient number, since it is larger than the sum of its proper divisors (714581302).

816664328 is a wasteful number, since it uses less digits than its factorization.

816664328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102083047 (or 102083043 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The square root of 816664328 is about 28577.3394142982. The cubic root of 816664328 is about 934.7192682888.

The spelling of 816664328 in words is "eight hundred sixteen million, six hundred sixty-four thousand, three hundred twenty-eight".