2556216228 has 96 divisors (see below), whose sum is σ = 6466682880. Its totient is φ = 783573120.

The previous prime is 2556216209. The next prime is 2556216263. The reversal of 2556216228 is 8226126552.

It is a happy 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, 1427958 + ... + 1429746.

It is an arithmetic number, because the mean of its divisors is an integer number (67361280).

Almost surely, 2^2556216228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556216228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3233341440).

2556216228 is an abundant number, since it is smaller than the sum of its proper divisors (3910466652).

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

2556216228 is a wasteful number, since it uses less digits than its factorization.

2556216228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2015 counting only the distinct ones).

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

The square root of 2556216228 is about 50559.0370557035. The cubic root of 2556216228 is about 1367.3064501083.

The spelling of 2556216228 in words is "two billion, five hundred fifty-six million, two hundred sixteen thousand, two hundred twenty-eight".