8220609 has 10 divisors (see below), whose sum is σ = 12280290. Its totient is φ = 5480352.

The previous prime is 8220581. The next prime is 8220631. The reversal of 8220609 is 9060228.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 685584 = 2745^2 + 828^2 .

It is not a de Polignac number, because 8220609 - 2⁵ = 8220577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

8220609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8220649) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50664 + ... + 50825.

It is an arithmetic number, because the mean of its divisors is an integer number (1228029).

Almost surely, 2^8220609 is an apocalyptic number.

It is an amenable number.

8220609 is a deficient number, since it is larger than the sum of its proper divisors (4059681).

8220609 is a wasteful number, since it uses less digits than its factorization.

8220609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101501 (or 101492 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 8220609 is about 2867.1604419704. The cubic root of 8220609 is about 201.8217638318.

The spelling of 8220609 in words is "eight million, two hundred twenty thousand, six hundred nine".