8220405287 has 2 divisors, whose sum is σ = 8220405288. Its totient is φ = 8220405286.

The previous prime is 8220405269. The next prime is 8220405289. The reversal of 8220405287 is 7825040228.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8220405287 - 2¹⁸ = 8220143143 is a prime.

Together with 8220405289, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8220405287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8220405289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110202643 + 4110202644.

It is an arithmetic number, because the mean of its divisors is an integer number (4110202644).

Almost surely, 2^8220405287 is an apocalyptic number.

8220405287 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220405287 is an equidigital number, since it uses as much as digits as its factorization.

8220405287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 8220405287 is about 90666.4507246203. The cubic root of 8220405287 is about 2018.2009671860.

The spelling of 8220405287 in words is "eight billion, two hundred twenty million, four hundred five thousand, two hundred eighty-seven".