8816780909 has 4 divisors (see below), whose sum is σ = 8818191804. Its totient is φ = 8815370016.

The previous prime is 8816780891. The next prime is 8816780911. The reversal of 8816780909 is 9090876188.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7035518884 + 1781262025 = 83878^2 + 42205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8816780909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8816780939) 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, 696032 + ... + 708585.

It is an arithmetic number, because the mean of its divisors is an integer number (2204547951).

Almost surely, 2^8816780909 is an apocalyptic number.

It is an amenable number.

8816780909 is a deficient number, since it is larger than the sum of its proper divisors (1410895).

8816780909 is a wasteful number, since it uses less digits than its factorization.

8816780909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410894.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 8816780909 is about 93897.7151425955. The cubic root of 8816780909 is about 2065.8717157146.

The spelling of 8816780909 in words is "eight billion, eight hundred sixteen million, seven hundred eighty thousand, nine hundred nine".