7220866860 has 36 divisors (see below), whose sum is σ = 21903296688. Its totient is φ = 1925564448.

The previous prime is 7220866811. The next prime is 7220866867. The reversal of 7220866860 is 686680227.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (7220866867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20057784 + ... + 20058143.

It is an arithmetic number, because the mean of its divisors is an integer number (608424908).

Almost surely, 2^7220866860 is an apocalyptic number.

It is an amenable number.

7220866860 is an abundant number, since it is smaller than the sum of its proper divisors (14682429828).

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

7220866860 is a wasteful number, since it uses less digits than its factorization.

7220866860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40115942 (or 40115937 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 7220866860 is about 84975.6839336995. The cubic root of 7220866860 is about 1932.8424081167.

The spelling of 7220866860 in words is "seven billion, two hundred twenty million, eight hundred sixty-six thousand, eight hundred sixty".