816868784 has 20 divisors (see below), whose sum is σ = 1583440320. Its totient is φ = 408239040.

The previous prime is 816868783. The next prime is 816868799. The reversal of 816868784 is 487868618.

It is a super-2 number, since 2×816868784² = 1334549220547277312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816868783) 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 3 ways as a sum of consecutive naturals, for example, 25889 + ... + 47999.

It is an arithmetic number, because the mean of its divisors is an integer number (79172016).

Almost surely, 2^816868784 is an apocalyptic number.

It is an amenable number.

816868784 is a deficient number, since it is larger than the sum of its proper divisors (766571536).

816868784 is a wasteful number, since it uses less digits than its factorization.

816868784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24428 (or 24422 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 56.

The square root of 816868784 is about 28580.9164303736. The cubic root of 816868784 is about 934.7972656618.

The spelling of 816868784 in words is "eight hundred sixteen million, eight hundred sixty-eight thousand, seven hundred eighty-four".