8220509775 has 30 divisors (see below), whose sum is σ = 15227229512. Its totient is φ = 4384270800.

The previous prime is 8220509767. The next prime is 8220509797. The reversal of 8220509775 is 5779050228.

It is a happy number.

It is not a de Polignac number, because 8220509775 - 2³ = 8220509767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8220509775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2027731 + ... + 2031780.

Almost surely, 2^8220509775 is an apocalyptic number.

8220509775 is a deficient number, since it is larger than the sum of its proper divisors (7006719737).

8220509775 is a wasteful number, since it uses less digits than its factorization.

8220509775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059533 (or 4059519 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 8220509775 is about 90667.0269447499. The cubic root of 8220509775 is about 2018.2095181386.

The spelling of 8220509775 in words is "eight billion, two hundred twenty million, five hundred nine thousand, seven hundred seventy-five".