809716623 has 16 divisors (see below), whose sum is σ = 1099929600. Its totient is φ = 529699680.

The previous prime is 809716619. The next prime is 809716693. The reversal of 809716623 is 326617908.

It is a happy number.

It is not a de Polignac number, because 809716623 - 2² = 809716619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809716693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75298 + ... + 85376.

It is an arithmetic number, because the mean of its divisors is an integer number (68745600).

Almost surely, 2^809716623 is an apocalyptic number.

809716623 is a deficient number, since it is larger than the sum of its proper divisors (290212977).

809716623 is a wasteful number, since it uses less digits than its factorization.

809716623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10582.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 809716623 is about 28455.5200795909. The cubic root of 809716623 is about 932.0610331530.

The spelling of 809716623 in words is "eight hundred nine million, seven hundred sixteen thousand, six hundred twenty-three".