2218728806 has 16 divisors (see below), whose sum is σ = 3825525024. Its totient is φ = 945386304.

The previous prime is 2218728751. The next prime is 2218728829. The reversal of 2218728806 is 6088278122.

2218728806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455615 + ... + 460458.

It is an arithmetic number, because the mean of its divisors is an integer number (239095314).

Almost surely, 2^2218728806 is an apocalyptic number.

2218728806 is a deficient number, since it is larger than the sum of its proper divisors (1606796218).

2218728806 is a wasteful number, since it uses less digits than its factorization.

2218728806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916255.

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 2218728806 is about 47103.3842308597. The cubic root of 2218728806 is about 1304.2717086435.

The spelling of 2218728806 in words is "two billion, two hundred eighteen million, seven hundred twenty-eight thousand, eight hundred six".