2216650728780 has 288 divisors, whose sum is σ = 7385894530560. Its totient is φ = 556120857600.

The previous prime is 2216650728769. The next prime is 2216650728781. The reversal of 2216650728780 is 878270566122.

2216650728780 is a `hidden beast` number, since 2 + 2 + 1 + 66 + 507 + 2 + 8 + 78 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (2216650728781) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 409048911 + ... + 409054329.

It is an arithmetic number, because the mean of its divisors is an integer number (25645467120).

Almost surely, 2^{2216650728780} is an apocalyptic number.

2216650728780 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 2216650728780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3692947265280).

2216650728780 is an abundant number, since it is smaller than the sum of its proper divisors (5169243801780).

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

2216650728780 is a wasteful number, since it uses less digits than its factorization.

2216650728780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10411 (or 10397 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 2216650728780 in words is "two trillion, two hundred sixteen billion, six hundred fifty million, seven hundred twenty-eight thousand, seven hundred eighty".