816711860 has 12 divisors (see below), whose sum is σ = 1715094948. Its totient is φ = 326684736.

The previous prime is 816711851. The next prime is 816711869. The reversal of 816711860 is 68117618.

It is an interprime number because it is at equal distance from previous prime (816711851) and next prime (816711869).

It can be written as a sum of positive squares in 2 ways, for example, as 100721296 + 715990564 = 10036^2 + 26758^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816711869) 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, 20417777 + ... + 20417816.

It is an arithmetic number, because the mean of its divisors is an integer number (142924579).

Almost surely, 2^816711860 is an apocalyptic number.

It is an amenable number.

816711860 is an abundant number, since it is smaller than the sum of its proper divisors (898383088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816711860 is a wasteful number, since it uses less digits than its factorization.

816711860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40835602 (or 40835600 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 816711860 is about 28578.1710401488. The cubic root of 816711860 is about 934.7374023057.

The spelling of 816711860 in words is "eight hundred sixteen million, seven hundred eleven thousand, eight hundred sixty".