816716638 has 16 divisors (see below), whose sum is σ = 1295441280. Its totient is φ = 385545600.

The previous prime is 816716633. The next prime is 816716639. The reversal of 816716638 is 836617618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816716633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158103 + ... + 163186.

It is an arithmetic number, because the mean of its divisors is an integer number (80965080).

Almost surely, 2^816716638 is an apocalyptic number.

816716638 is a deficient number, since it is larger than the sum of its proper divisors (478724642).

816716638 is a wasteful number, since it uses less digits than its factorization.

816716638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321363.

The product of its digits is 290304, while the sum is 46.

The square root of 816716638 is about 28578.2546352992. The cubic root of 816716638 is about 934.7392251300.

The spelling of 816716638 in words is "eight hundred sixteen million, seven hundred sixteen thousand, six hundred thirty-eight".