8720036609 has 2 divisors, whose sum is σ = 8720036610. Its totient is φ = 8720036608.

The previous prime is 8720036599. The next prime is 8720036639. The reversal of 8720036609 is 9066300278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5603271025 + 3116765584 = 74855^2 + 55828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8720036609 is a prime.

It is not a weakly prime, because it can be changed into another prime (8720036639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360018304 + 4360018305.

It is an arithmetic number, because the mean of its divisors is an integer number (4360018305).

Almost surely, 2^8720036609 is an apocalyptic number.

It is an amenable number.

8720036609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720036609 is an equidigital number, since it uses as much as digits as its factorization.

8720036609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 8720036609 is about 93381.1362588826. The cubic root of 8720036609 is about 2058.2878135577.

The spelling of 8720036609 in words is "eight billion, seven hundred twenty million, thirty-six thousand, six hundred nine".