2209568820 has 96 divisors (see below), whose sum is σ = 6271993728. Its totient is φ = 581148672.

The previous prime is 2209568797. The next prime is 2209568833. The reversal of 2209568820 is 288659022.

It is a super-3 number, since 3×2209568820³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2577832 + ... + 2578688.

It is an arithmetic number, because the mean of its divisors is an integer number (65333268).

Almost surely, 2^2209568820 is an apocalyptic number.

2209568820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2209568820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3135996864).

2209568820 is an abundant number, since it is smaller than the sum of its proper divisors (4062424908).

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

2209568820 is a wasteful number, since it uses less digits than its factorization.

2209568820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1407 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 2209568820 is about 47006.0508870932. The cubic root of 2209568820 is about 1302.4743446869.

The spelling of 2209568820 in words is "two billion, two hundred nine million, five hundred sixty-eight thousand, eight hundred twenty".