2556187128 has 48 divisors (see below), whose sum is σ = 7552373400. Its totient is φ = 774601920.

The previous prime is 2556187111. The next prime is 2556187129. The reversal of 2556187128 is 8217816552.

2556187128 is a `hidden beast` number, since 2 + 5 + 5 + 618 + 7 + 1 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556187129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1612963 + ... + 1614546.

Almost surely, 2^2556187128 is an apocalyptic number.

It is an amenable number.

2556187128 is an abundant number, since it is smaller than the sum of its proper divisors (4996186272).

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

2556187128 is a wasteful number, since it uses less digits than its factorization.

2556187128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227532 (or 3227525 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 2556187128 is about 50558.7492725048. The cubic root of 2556187128 is about 1367.3012616103.

The spelling of 2556187128 in words is "two billion, five hundred fifty-six million, one hundred eighty-seven thousand, one hundred twenty-eight".