8210920809 has 64 divisors (see below), whose sum is σ = 13624647680. Its totient is φ = 4283020800.

The previous prime is 8210920787. The next prime is 8210920843. The reversal of 8210920809 is 9080290128.

It is not a de Polignac number, because 8210920809 - 2⁷ = 8210920681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8210920409) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16859964 + ... + 16860450.

It is an arithmetic number, because the mean of its divisors is an integer number (212885120).

Almost surely, 2^8210920809 is an apocalyptic number.

It is an amenable number.

8210920809 is a deficient number, since it is larger than the sum of its proper divisors (5413726871).

8210920809 is a wasteful number, since it uses less digits than its factorization.

8210920809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 8210920809 is about 90614.1313979227. The cubic root of 8210920809 is about 2017.4244868542.

The spelling of 8210920809 in words is "eight billion, two hundred ten million, nine hundred twenty thousand, eight hundred nine".