816775646 has 8 divisors (see below), whose sum is σ = 1225944120. Its totient is φ = 408127608.

The previous prime is 816775643. The next prime is 816775657. The reversal of 816775646 is 646577618.

816775646 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.

It is a super-3 number, since 3×816775646³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 816775594 and 816775603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816775643) 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, 126161 + ... + 132476.

It is an arithmetic number, because the mean of its divisors is an integer number (153243015).

Almost surely, 2^816775646 is an apocalyptic number.

816775646 is a deficient number, since it is larger than the sum of its proper divisors (409168474).

816775646 is a wasteful number, since it uses less digits than its factorization.

816775646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260218.

The product of its digits is 1693440, while the sum is 50.

The square root of 816775646 is about 28579.2870100008. The cubic root of 816775646 is about 934.7617363092.

The spelling of 816775646 in words is "eight hundred sixteen million, seven hundred seventy-five thousand, six hundred forty-six".