8220609780 has 48 divisors (see below), whose sum is σ = 23119145280. Its totient is φ = 2182501888.

The previous prime is 8220609779. The next prime is 8220609781. The reversal of 8220609780 is 879060228.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8220609779) and next prime (8220609781).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220609781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288165 + ... + 315404.

It is an arithmetic number, because the mean of its divisors is an integer number (481648860).

Almost surely, 2^8220609780 is an apocalyptic number.

It is an amenable number.

8220609780 is an abundant number, since it is smaller than the sum of its proper divisors (14898535500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8220609780 is a wasteful number, since it uses less digits than its factorization.

8220609780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603808 (or 603806 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 8220609780 is about 90667.5784390429. The cubic root of 8220609780 is about 2018.2177021495.

The spelling of 8220609780 in words is "eight billion, two hundred twenty million, six hundred nine thousand, seven hundred eighty".