816438068 has 6 divisors (see below), whose sum is σ = 1428766626. Its totient is φ = 408219032.

The previous prime is 816438067. The next prime is 816438079. The reversal of 816438068 is 860834618.

816438068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 536478244 + 279959824 = 23162^2 + 16732^2 .

It is a super-2 number, since 2×816438068² = 1333142237759145248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816438067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102054755 + ... + 102054762.

It is an arithmetic number, because the mean of its divisors is an integer number (238127771).

Almost surely, 2^816438068 is an apocalyptic number.

It is an amenable number.

816438068 is a deficient number, since it is larger than the sum of its proper divisors (612328558).

816438068 is a wasteful number, since it uses less digits than its factorization.

816438068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204109521 (or 204109519 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 816438068 is about 28573.3804090451. The cubic root of 816438068 is about 934.6329377901.

The spelling of 816438068 in words is "eight hundred sixteen million, four hundred thirty-eight thousand, sixty-eight".