2215564806 has 128 divisors (see below), whose sum is σ = 5881881600. Its totient is φ = 539965440.

The previous prime is 2215564789. The next prime is 2215564837. The reversal of 2215564806 is 6084655122.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 422730 + ... + 427938.

It is an arithmetic number, because the mean of its divisors is an integer number (45952200).

Almost surely, 2^2215564806 is an apocalyptic number.

2215564806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2215564806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2940940800).

2215564806 is an abundant number, since it is smaller than the sum of its proper divisors (3666316794).

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

2215564806 is a wasteful number, since it uses less digits than its factorization.

2215564806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5294.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 2215564806 is about 47069.7865514600. The cubic root of 2215564806 is about 1303.6514317153.

The spelling of 2215564806 in words is "two billion, two hundred fifteen million, five hundred sixty-four thousand, eight hundred six".